TR-161 TECHNICAL REPORT GEOMAGNETIC AND BATHYMETRIC PROFILES ACROSS THE NORTH ATLANTIC OCEAN OTIS E. AVERY Geomagnetics Branch Marine Surveys Division NOVEMBER 1963 / TUS U. S. NAVAL OCEANOGRAPHIC OFFICE \ vce. TR- 1G] | WASHINGTON, D.C. 20390 Price $1.35 ABSTRACT This report presents total magnetic intensity and bathymetric data collected on simultaneous North Atlantic crossings. Three ships, USNS BOWDITCH, USNS DUTTON, and USNS MICHELSON participated in the survey operations. These ships were equipped with nuclear resonance magnetometers and precision depth recorders. A combined total of approx- imately 17,200 miles of track was surveyed. The data presentation is in profile form and is divided into two parts. Part | presents the data from the westbound crossing be- tween the Norwegian Sea and New York, and Part II presents the data from the eastbound crossing. FOREWORD In the mid-1950's, the Hydrographic Office--now the Oceanographic Office--initiated a program for eonducring geomagnetic measurements at sea. A major part of this program involves conducting total magnetic intensity surveys aboard ''ships of opportunity'’ while these ships are engaged in some primary tactical or logistics mission. This report presents geomagnetic and bathymetric data from such a survey. Much data of this type will be required for an accurate interpretation of the geologic and structural character of the ocean This report is presented to help advance an understanding of b, CQ DE W. KNOLL Rear Admiral, U. S. Navy Commander basins. these vast areas. nnn Timon Lii ae tS) Roe eit st) CONTENTS Page Ly — LUNIDNOMDUCHIWON 6 5 5 6 5 oOo 6 6G Ooo oO 1 II. SURVEY OPERATIONS Ave CONGUCE SO "SUIRVEW~) Gan vel frie or cc i) te st te ey Oe 4 Ig Nonea@eatein SOE) co We? Word 6 8 8 5 6 o G oo Oo 4 2, iWary Yaoredls = Normaestem SG 56 5656600050000 0 5) Bo (Gomera 45" Gio. ano 6) Bb ceo BOON O.FO: “On Ob cmos Roe so ec 5 Go IWASERUMNEMEAIETOM 5650560000050 0 000 60 6 IIL. DATA PROCESSING MM. Iee@ilaunlimarey WajeE, PyCOKCOSSNs 5.5 6 6 6 46 56 05 0 0 7 Bo WeSMGEte IWanjoxomell Warslalons 56 6566.46 6 6 6060 6 0 7 IV. DATA PRESENTATION PART I: NORWEGIAN SEA - NEW YORK (FIGS. 2-30) .... 11 PART II: NEW YORK - NORWEGIAN SEA (FIGS. 31-60) ... 43 TABLE TABLE IT. GAMMA RANGES FOR K-INDICES .........2.2.. 9 er a -_ 4 a +. he . ithe sro @ _ P Su pus ee ae : rs « Tats i ue ies ee Siac ae | e. , eat * ‘wall ; ee beaueet De Bes ease are) é 7 Caiwet jae : Fares: $i sa 2 - Sapaae? \ & 7 : eye ‘ied 4 ali i al = | % | - a ais ee k ee ef get Baa a8 di ba 5 la 2 | iy : a i } ; sural ie - wi aay mi lb ; se mo rt ee A a oF, oe ; ne a I. INTRODUCTION In November 1961, three oceanographic survey ships--USNS BOWDITCH (T-AGS 21), USNS DUTTON (T-AGS 22), and USNS MICHELSON (T-AGS 23)-- returned to New York from survey operations in the Norwegian Sea. This voyage provided the Oceanographic Office an unusual opportunity to collect magnetic and bathymetric data during multi-ship survey operations. The three ships returned to the Norwegian Sea in March 1962, and again magnetic and bathymetric measurements were taken con- currently. This report presents the magnetic data obtained on these North Atlantic crossings. Bathymetric data are included for direct compari- son between magnetic and topographic features. The data presentation is in profile form and is divided into two parts. Part I presents the data from the westbound crossing between the Norwegian Sea and New York; Part IL presents the data from the eastbound crossing. In Part I, the profiles observed concurrently by each of the three ships during the westbound crossing are presented together on the same pages. This type of presentation was arranged so that any trends could be observed readily. In Part IL, profiles from the BOWDITCH and DUTTON also are presented on the same pages. The MICHELSON data, however, are presented separately because the MICHELSON route on the return crossing differed considerably from the routes of the other two ships. The amount of data contained in this report is so extensive that a complete analysis would make it unavailable for a long time. There- fore, no analysis or interpretation is presented in this report. GREENLAND CANADA LABRADOR BASIN NEW BRUNSWICK GRAND BAINKS NEWFOUNDLAND MILNE BASIN ig iS g Our, S eae e D ~ Ridge AND = Se USNS MICHELSON Sy MAR. '62 rv FIGURE 1.— TRACK CHART NORWEGIAN SEA NOY ‘61 USNS_DUTTON OUTER BAILEY BANK BILL % % wy iS) AN} BAILEY'S BANK h U USNS BOWDITCH NOV '61 SHETLAND,(f ISLANDS USNS MICHELSON = NOV ‘61 NORTH SEA ENGLAND {55 KE BELGIUM FRANCE II. SURVEY OPERATIONS A. Conduct of Survey 1. Norwegian Sea - New York The survey was conducted along tracks that correspond roughly to great-circle routes between the Norwegian Sea and New York. (Fig. 1) At 0330, 20 November 1961, the three ships rendezvoused in the Norwegian Sea. At this time, they formed a three-abreast array to be maintained during the Atlantic crossing. BOWDITCH assumed the center position and was responsible for setting the course and speed during the survey. DUTTON took a position 10 miles to the northward of BOWDITCH, and MICHELSON took a position 10 miles to the southward of BOWDITCH. These positions were maintained until 0900, 27 November. At that point, about 1200 miles from New York, MICHELSON developed boiler trouble and was unable to maintain survey speed. MICHELSON broke formation at 0230, 28 November, and set a direct course for New York. BOWDITCH and DUTTON continued in formation on a route south of Georges Bank. When the three ships arrived in New York on 1 December 1961, they had completed a combined total of approximately 9350 miles of survey track. Adverse weather conditions prevailed during most of the crossing. Because of this, the ships' speeds varied from 12 to 17 knots. Ona few occasions, the seas were too rough to tow the magnetometer sensing units. At 1100, 29 November, the magnetometer sensing unit towed by DUTTON was damaged because of constant jerking in heavy seas. A spare was available, but rough seas prevented launching during the remaining 300 miles of the trip. 2. New York - Norwegian Sea After undergoing extensive overhaul, the three ships departed New York on 2 March 1962. BOWDITCH and DUTTON conducted survey operations similar to those of the westbound crossing. Again, their tracks corresponded roughly to great-circle routes between New York and the Norwegian Sea. DUTTON maintained a position 10 miles southward of BOWDITCH. MICHELSON's survey track, however, was con- siderably south of the other two ships' tracks and terminated south @:e Iraaileyals (Caak=35 106) During these crossings, severe storms made it difficult for the ships to maintain their positions relative to each other. At times, the ships were forced to heave to, and the magnetometer sensing units were not towed. Consequently, there are several gaps in the magnetic profiles obtained during these crossings. MICHELSON ended its survey track at 0100, 11 March, DUTTON at 0330, 12 March, and BOWDITCH at 1130, 13 March, after completing a three-ship total of approximately 7850 miles of eastbound survey tracks. During westbound and eastbound crossings, the three ships surveyed a combined total of approximately 17,200 miles of track. B. Control On those parts of the survey tracks lying in mid-ocean, survey control was by Loran-A, with occasional celestial fixes. Navigation in these areas was hampered considerably by the adverse weather con- ditions. Consequently, many of the positions were determined by dead- reckoning. For most of the track in midocean, the probable position error is within 5 miles and is at no time considered to be greater than 10 miles. The position of each ship was determined at 15-minute time intervals and then plotted on Mercator Plotting Sheets (scale: is longitude = 4 inches). Near land areas, Loran-C or Decca was usually available. Here the maximum position error is less than 1 mile. The relative positions of the ships were maintained by taking occasional radar ranges and bearings from one ship to another. After completion of the survey, each ship's smooth-plotted survey track was transferred to a master set of plotting sheets. The best position fixes from each ship were combined with the intership radar range and bearing data. Consequently, the resulting adjusted tracks represent a compilation of the best possible positioning information. C. Instrumentation Each survey ship was equipped with a Varian nuclear resonance magnetometer, Model XN-4901. With this instrument, the absolute value of the total magnetic field intensity can be measured to an accuracy of about +1 gamma. The sensing unit was towed 500 feet astern to reduce the effect of the ship's magnetic field. Data were recorded on a Varian G-1l analog recorder in units of "magnetometer counts."! These units, an inherent property of the magnetometer design, are an inverse function of the total magnetic field intensity. Each ship also was equipped with a standard Edo AN/UQN Sonar set. Instrument output was recorded directly in fathoms on a Mark VI Pre- cision Depth Recorder. Greenwich Mean Time was used exclusively for all survey work. The time marks for both the magnetometer and the Precision Depth Recorder were provided automatically by a central clock on each ship. 6 III. DATA PROCESSING A. Preliminary Data Processing Magnetometer records were scaled at 50-gamma intervals and also at times when maximum and minimum values of magnetic intensity were recorded. Gamma values were obtained by using a scaling template designed for converting magnetometer counts to gammas. Precision Depth Recorder traces were scaled directly at 100- fathom intervals and also for maximum and minimun recorded depths. No sound-velocity or other corrections have been applied to the bathy- metric data. Magnetic and bathymetric profiles for each of the three ships were constructed using the adjusted survey tracks as base lines. An index to the geographical location of each profile is given in Figure 2, Part I (Norwegian Sea - New York), and in Figure 31, Part II (New York - Norwegian Sea). Profiles in Part I are presented in reverse numerical sequence from west to east to provide a more effective presentation. Adjusted smooth plots of the survey tracks are shown on the upper portions of the profile sheets. B. Magnetic Temporal Variations The magnetic data were not corrected for temporal variations of the earth's magnetic field; however, records from the magnetic observa- tories at Fredericksburg, Virginia, and Hartland, England, were studied to determine if there were any unusual magnetic disturbances during the Atlantic crossings. The records obtained from each observatory were in the form of the 3-hour, magnetic K-index. Conventionally, the K-index is a digit from 0 to 9. These digits indicate the difference between maximum and minimum values of one of the magnetic vector components occurring during specified 3-hour time intervals. Table I lists the gamma ranges for the K-index values at Fredericksburg and Hartland. The K-indices from each observatory are given in graphical form in Figures 3 and 32 appearing at the beginning of Parts I and II respectively. It should be noted that the records from these two observatories represent geomagnetic conditions existing within only a few miles of their respective geographic locations. These records can, however, give an indication of conditions that probably occurred in areas adjacent to the observatories. Figure 3 shows that during the November 1961 crossing, the K- index values from Fredericksburg exceeded index 3 (40 gammas) for only one 3-hour interval, 0600-0900, 20 November. During this interval, however, the survey ships were nearer to Hartland than to Fredericksburg. The Hartland values never exceeded index 3 during the entire time of the westbound crossing. Figure 32 reveals that geomagnetic conditions were more disturbed during the March 1962 crossing. On 5 and 6 March, K-indices exceeded index 3 at both observatories, Thewlues from Hartland again exceeded index 3 on 10, 12, and 13 March. At no time during westbound or east- bound crossings did the K-index values of either observatory exceed index 5 (120 gammas). It is assumed, therefore, that no significant temporal anomalies are incorporated in the magnetic data profiles. TABLE I GAMMA RANGES FOR K-INDICES Fredericksburg and Hartland Magnetic Observatories K-INDEX GAMMA RANGES 0 0-5 1 5-10 2 10-20 3 20-40 4 40-70 5 70-120 6 120-200 7 200-330 8 330-500 9 500-Up i; ™ cee; Ni 7 i H t ‘ udp RES : : 1 Adore tek eae os i 4 ain Ales vee alts i IV. DATA PRESENTATION PART I: NORWEGIAN SEA - NEW YORK (FIGS, 2-30) 11 | GREENLAND 54 FIGURE 2.— PROFILE INDEX NORWEGIAN SEA—NEW YORK CANADA i mi pow i> AN RW ov F coe m) 2 e S 2 Ww S Va ip % NEW é or Ge) BRUNSWICK vy x NES ~ Y 2) Z wo ae <2 < 28 SS SF A129 =. USNS] HELS MIC USNS ay OWDITCH z USNS DUTTON 12 1 USNS DUTTON ——= 65 (5) We =a eecoN _— USNS BOWDITCH BA a wy > \ SHETLAND ISLANDS fi J c) § NORTH SEA ENGLAND “er (BELGIUM Ww +55 wh \S ene” 13 ALIAILDY DILANOVWWNORS 4O SADIGNI-M—‘€ 3YNDIS GNV1I9SN3 ‘ONV1ILYVH VINIDSYIA ‘SenasynoiwsqgYys K-INDEX K-INDEX DEPTH IN FATHOMS ” < = = < oO z > = un” 7 wo [= Zz UV = w Z oO < = = < i (e) = sz WOuNVN EA) oe 0z ol 0 Ss OL 62-82 S3a1IdOY¥d DIYLAWAHLVG GNV DILANOVW —'p 3enNdls NOS1IHIIW mo 006e —i 19. 330 | ———. - 0000 A3AINS 4O ONI | ALID SILNVILY DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS 15 RNOANYD VINOD) 13A31 VaS NOST3HIIW TOTAL MAGNETIC INTENSITY IN GAMMAS as "a > ozt 008 NOSIJHIIW | i oott_0 gO 0060 000! ool ee? corp gov 00s0_0090_0040_ 002 _Ol ¢MNVE SA9DYNORD 16 DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS So i=} Ve) x wo ——— NOST3HDIW 19. “AON 8% SW WOUNWN ETT tA o£ yd i CT t Z£e-1t2 SATAONd DIMLAWAHLVSE GNV SILANDVN 13A31 VAS —'9 3YnNdSI4S NOSTIHSIW. ooses OOSvS DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS 17 | | | | DUTTON 30 NOV. | 61 | 11,00 1000 oe : 22__as00_'ps00_0490____g30__o200_9}0__gano 29002200 109 1100} 1000 090 5 ni : e x 2 ‘ eeeetemeeitt I 30 NOV. 61 sa 0600 0500 0400 0300 0200 0100 0000-2300 2200 mmm. 8000 BOWDITCH 20. ~~ 900 DUTTON 20 8 29 NOV. ‘61 AIAMNS 40 ANF —NO MAGNETIC DATA— SWOHLV4 NI Hid3d SWOHLV4 NI Hid3G SVWWV9 NI ALISN3LNI DIZNOVW TvLOL SVWWY9 NI ALISN3LNI DILINOVW 1VLOL BOWDITCH SEA LEVEL m 9 z q = =x Z = Z z an : z a 2 a FIGURE 7.— MAGNETIC AND BATHYMETRIC PROFILES 25-26 10 5 0 10 20 0 NAUTICAL MILES 18 DUTTON DUTTON DUTTON 29 NOV. 61 29 NOV. 61 1900 1900 « —— - 27NOV. 3 1800 -—— 97500 14001300 1200 11001000 1% 1700 16 BOWDITCH os | BOWDITCH 1000 — 76 1400 ——9 ‘700 080 0: 39°N i eg —T60 100 1000 29 Nov. 61, 7090 0800 G700 0600 | ay 1600 150} BOWDITCH BOWDITCH ie 7 09007 0800-0700 | | | | | ae pee 53500 —NO MAGNETIC DATA— = ° g 2 = > (a) Z m = fa) Zz m ae z 2 Zz (a) > : un SVWWY9 NI ALISN3LNI DILINOVW 1VLOL SVWWY9 NI ALISNSLNI SILINOVW 1VLOL SVWWYV9 NI ALISNSLNI SILINOVW TVLOL DUTTON SEA LEVEL EA LEVEL SWOHLV4 NI H1d3d SWOHLV4 NI Hid3G SWOHLV4 NI H1d3G SWOHLV4 NI Hid3aG SVWWY9 NI ALISN3LNI SILINOVW 1VLOL SVWWYV9D_ NI ALISN3LNI SILINOVWW_1VLOL SVWWYV9 NI ALISN3LNI SWINOWW 1VLOL SVWWVS NI ALISNALNI SILINDVW IVLOL BOWDITCH BOWDITCH SEA LEVEL SBA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d SWOHLV4 NI H1d3ad SWOHLV4 NI Hld3ad FIGURE 8.— MAGNETIC AND BATHYMETRIC PROFILES 23-24 AND 24-25 1OmsomaO) 10 20 30 (“HEH Et E93 nautical mites 19 &- 7600 28 NOV. 61) BOWDITCH =) (eo) ss > = = > Q Z m =! fa) Z a m 7L a = < Z (9) > = = > a SVWWY9 Ni ALISNSLNI DILINOVW 1VLOL DUTTON SEA LEVEL SWOHLV4 NI H1d3d SWOHLV4 NI Hid3d SVWWY9 Ni ALISNSLNI SILANOVW TVWLOL SVYWWV9 NI ALISN3LNI SILANOVW 1VLOL BOWDITCH SEA LEVEL SWOHLV4 NI H1d3d SWOHLV4 NI Hid3d FIGURE 9.— MAGNETIC AND BATHYMETRIC PROFILES 22-23 JQ 4 10 20 30 (HHA FTF NAUTICAL MILES 20 1700 28 NOV. 61 | 7600 a —— ; be DUTTON 1400 1300 y 0 109 1700) V4 i , 1400 1 1600 ss 1 900 428 NOV. 61 1300 O 4y BOWDITCH SVWWYSD NI ALISN3LNI SILINDVYW IVLOL SVWWV9 NI ALISN3LNI SILINDVW IVLOL SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI H1d3d SVWWYV9 NI ALISN3LNI DILANDVW IVLOL SVWWV9 NI ALISNALNI DILINDVW IWLOL BOWDITCH SWOHLV4 NI Hld30 SWOHLV4 NI Hiddd FIGURE 10.— MAGNETIC AND BATHYMETRIC PROFILES 21-22 195 0 10 20. _30 oo — oo | NAUTICAL MILES \ 21 GREEN BANKS | MICHELSON, 28 NOV. 6) | —— - a ¥ 0 1600 105007 0200 0 Nt +9400 a 7 0200 036 ; l 0 53 1500 7400 | 27, “NOV. 6) DUTTON 50 ne OUOO [nn 2 RT SE 2200 2100 i nov er BOWDITCH if BOWDITCH I ax 2300 Svwwv9d NI ALISNSLNI SILINDVW IVLOL wr o ° ° fo) SVWWYV9 NI ALISN3LNI SILINOVW_ 1VLOL DUTTON SEA LEVEL SWOHLV4 NI H1d3d SWOHLV4 NI H1ld3d nn i fo} fo} vo) —NO MAGNETIC — DATA SvWwwvd Ni a Hn 5 Sones ALISN3LNI_ SILANOVW 1VLOL BOWDITCH = ° = > r = > (9) Z m =! fo) Z =I m Z 2 2 SEA LEVEL SWOHLV4 NI H1d3d Svwwv9d NI ALISN3LNI DUAJNOVW TWLOL | SWOHLV4 NI Hidid SVWWY9 NI ALISN3LNI SILENOVW 1VLOL SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d FIGURE 11.— MAGNETIC AND BATHYMETRIC PROFILES 20-21 LOS en O) 10 20 30 NAUTICAL MILES 22 1500 27NOV ‘6, DUTTON 1 te 1500 | 27 NOV. 6 s 2 . 4 EY 6) . | 0500 ———— ee Fa {ice 7 ‘wolTCH . ——~— ee . ° 0600 | is NOV. “4 1500. = 0500 —— 14 10 ——~—— 0 - ‘ MICHELSON 27 NOV. 61 S SVWWYD NI ALISN3LNI SILINDVW 1VLO SWOHLV4 NI Hid3G ) a > = = > (2) Z mi = (a) Zz =] mi Z a ZI 9 m 54 3 = Zz mal > 4 =x fe) = a —NO MAGNETIC DATA— BOWDITCH SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d SVWWY9 NI ALISN3LNI SILINDVW IVLOL a ra) Qa ° ro) SVWWYV9 NI wn @ 3° 3° fo} ALISNSLNI SILINDVW_IVLOL SWOHLV4 NI Hid3d SWOHLV4 NI H1ld3d FIGURE 12.— MAGNETIC AND BATHYMETRIC PROFILES 19-20 JO) 10 20 30 (—HRRO EEE NAUTICAL MILES 28) 0600 127, NOV. DUTTON N 0600 S 27NOV. 61 Al BOWDITCH 0500 27 NOV. 61 MICHELSON on wo fo] So oO a nN a ° fe) SVWWYS. NI svwwv9 NI SWOHLV4 NI Hld3G ALISN3LNI DILENOVW 1VLOL ALISN3LNI SILANOVW IWLOL SEA LEVEL SWOHLV4 NI Hid3d on wo °o fe} ro —NO MAGNETIC DATA— SvVWWV9 NI ALISN3LNI SILANOVW 1VLOL N Qa ° nN o fo] io} = ° g > = = > (a) 74 m = oO Z = m Zz g 2 BOWDITCH SWOHLV4 NI Hidad SWOHLV4 NI Hid3d NO MAGNETIC DATA on wo fo} fo) fo} SVWWY9 NI ALISN3LNI SILINOVW IVLOL N Q ° fo} SVWWY9_NI MICHELSON un nN fo} fo} o SWOHIV4 NI H1d30 ALISN3INI DINOVW 1VLOL SWOHLV4 NI Hid3d FIGURE 13.— MAGNETIC AND BATHYMETRIC PROFILES 18-19 1 5 0 10 20 30 NAUTICAL MILES 24 D, %D, 2000_1 1030 eZ 4. 2% NOV 61 5 i { 4 77100 DUTTON DUTTON. 26NOV. 1 4 100 [ 1030 BOWDITCH 26 NOV ‘61 | BOWDITCH 19 <> 26 NOV. ‘61 a 1100 1030 MICHELSON 26 NOV. ‘61 | MICHELSON ALISN3LNI SILINOVW W1LOl BOWDITCH SEA LEVEL °o ISWOHIV4 NI Hid3G Sa 8 $385 6 ooo fo SWOHLV4 NI Hidad w So So So SVWWY)D NI wn N a So SVWWV9 NI ALISN3LNI SILINDVW_1VLOL un nR So t=) °o = 5 > 9) Zz a fa) Z m re Ze 2 SEA LEVEL ou oo o oO Cee ow o 0 o 6 SWOH1V4_ NI H1ld3G SWOHLV4 NI Hid30 SVWWY9 NI ALISN3LNI_ SILINOVW_IVLOL SVWWYV9 NI SWOH1V4 NI Hid3G = ALISN3LNI DILAINOVW 1VLOL MICHELSON SEA LEVEL SWOHLV4 NI H1ld3d FIGURE 14.—MAGNETIC AND BATHYMETRIC PROFILES 17-18 10.5 10 20 30 (HEE Et tS NAUTICAL MILES 25 D, aa 4 So Go 7 07 e 3 “t » an | ooo 1000 0900 0800 0700 0600 0500 0400 300 26NOV él) DUTTON 1100" 000 0900 0800 og oo veel o700 my 0500 0400 0300 BOWDITCH By | 1100 * 5 ED 0 0 = % ssnov 61 7000 0900 ace 0700 ast oe aie MICHELSON | % wv LOL nn wo °o So So > Zz > ee Eu Fatal on Z a Z @) S| n N to) to} fo} SEA LEVEL SWOHLV4 NI Hiddd = fo) I > ze eo? z3 =O jnz m Z un = ~< e BOWDITCH SEA LEVEL m 3 25 ZA a > = =x fe) = wn 3, ) g Pa 53000 = > 3 | 9 li 52500 | a g Zz } 3 52000 @ = 2 é MICHELSON SEA, ee m 3 Be Z = > > Ae fe) = n FIGURE 15.— MAGNETIC AND BATHYMETRIC PROFILES 16-17 (O43 10 20 30 1: a — a — es — eT 26 TOL 310 2000 2300 2200 25 NOV 6) Wa DUTTON OC aa saa 00 pa Ia) 900, 0 rit ot FF 780 Tt 30 2200 NI 25"Nov. 6) i | BOWDITCH 2000 900 1830 | 25 Nov 6) MICHELSON a ey iS) N 3° a ro) 3° f=) ° VS NI ILINSVW. SYWWYD NI SWOHLV4 Ni H1ld30 ALISN3LNI SILINDVW TVLOL SEA LEVEL SWOHLV4 NI H1d3Q uisnainf nn Ld ao fo) is} SVWWY9 NI a wp So So BOWDITCH SEA LEVEL SV’ SWOHLYV4 NI Hid3q ALISN3LNI 3D 4 Q > - Q Zz a (a) Z a m Zz un =| ~< is) m a] a =z Zz mn > 4 =x fe) = n LANOVW,, W1OL SVWWYV9 NI SVWWV9 NI SWOHLV4 NI H1d30 Ay iignaINi SIND WW TW1OL SWOHLV4 NI Hld3d = ALISN3LNI 51 FIGURE 16.— MAGNETIC AND BATHYMETRIC PROFILES 15-16 10 5 0 10 20 30 CAE EES NAUTICAL MILES 27 | BOWDITCH Toy I 25 Nov. ’61 MICHELSON SVWWY9S NI SVWWY' SWOHLV4 NI H1lda0 ALISN3INI DILINDVW IWLOL ALISN3LNI SILINODVW 1VLOL SEA LEVEL WOHLVS NI Hid3d x4 fe) =a > - x Z m = fa) Z =| m Zz a 2 SvVWWYS NI ALISN3LNI DILINODVW IVLOL WDITCH BO SEA LEVEL SWOHLV4 NI H1id3d SWOHLV4 NI Hid3ad SVWWYVS N SWOHIV4 NI Hid3Gd ALISN3LNI SINS WW. IvLOL SWOHLV4 NI H1d30 yy igny3y) FIGURE 17.— MAGNETIC AND BATHYMETRIC PROFILES 14-15 1 5 {¢) 10 20 {*) I: os — oe — oa — BOE — +0200 1100 25 NOY. ‘61 25NOV. 6 DUTTONN, DUTTON I907 da UZ +0200 25 NOV. 61 "ee NOV. 6) BOWDITCH BOWDITCH 25 NOV. ‘6! MICHELSON eal 1100 7 rm 7,7 | 25NOV. 61 MICHELSON | un eo So o °o on nN an to} fo} on Ld o So So un un ° So SEA LEVEL SVWWYS NI ALISN3LNI DIINOVWW IVLOL SVWWV9 NI ALISN3ILNI SIANOVW 1VLOL a > — = fe) = a SEA LEVEL FIGURE 18.— MAGNETIC AND BATHYMETRIC PROFILES 13-14 lo_5 10 20 30 CHAR svt Mites 29 | a 25 NOV. 61 ' DUTTON J : 5 24 NOV, 61 25 NOV. '61 BOWDITCH BOWDITCH VA 0309 | & 25 NOV. 61 ~ MICHELSON Lae e on Ny t=] i=] o VWWYS NI ALISNALNI SILINOVWW 1VLOL a a fo} fo} SVWWY9 NI ALISN3LNI SILINDVW_1VLOL SEA LEVEL SWOHLY4 NI H1d3d SWOHLV4 NI H1d3d on un So o / —NO MAGNETIC DATA— a So So 3° SVWWY9 NI ALISN3LNI SILINOVW_1VLOL SvVWWY9_Ni x ie} = > - = > (or Z m = fo) Z =| m Z a 5 < wn o nn fo} fo} BOWDITCH SWOHLV4 Ni SWOHLV4 NI H1d30 OL un nN ° 3° ro) n un o o SVWWY9S NI ALISNALNI DILANDVW TL ALISN3LNI SILINDVW_IVLOL a o un So o SWOHLV4 NI H1d3d SWOHLV4 NI Hida FIGURE 19.— MAGNETIC AND BATHYMETRIC PROFILES 12-13 10) 4) {0} 10 20 30 CHAE NAUTICAL MILES 30 DUTTON ae T+ | 100, 1900 24 NOV 6! MICHELSON 24 Nov ¢| BOWODIT! 1800 1800 SVWWY9 NI ALISN3LNI SUANOVWW 1VLOL SEA LEVEL SWOHLV4 NI Hid3g0 NO MAGNETIC DATA WDITCH a2 SEA LEVEL —NO MAGNETIC DATA— SVWWY9 NI ALISNALNI SILINOVW 1VLOL MICHELSON SEA LEVEL an o oO io} ° So [e} SWOHLV4 NI H1d3q FIGURE 20.— MAGNETIC AND BATHYMETRIC PROFILES 11-12 10 5 0 10 20 30 CAA EE NAUTICAL MILES 31 24 NOV. 67 39 BOWDITCH | a 0900 + | 24 NOV Pe MICHELSON Laas 0700 on wn o So SVWWYV9_ NI ALISNALNI SILINOVWW 1VLOL a FS) fe] fo} w ° Qa ° fo) ALISN3LNI SILINOVW_ 1VLOL TON ou SEA LEVEL SWOHLV4 NI Hida SWOHLV4 NI Hid3d Svwwv9d Ni SVWWY9D NI ALISN3LNI SILINDVW_1VLOL = ° s > = (a) Zz m con oO Z SG nm Zz g 3 BOWDITCH SEA LEVEL SWOHLV4 NI Hidid SWOHLV4 Ni Hid3d SYWWYS NI ALISNSLNI SUWANOVYW WLOL a a o = a ° fo} ° roy o ALISN3LNI SILAINDVW_IVLOL SWOHLV4 NI Hid3d SWOHLV4 NI Hld3G FIGURE 21.— MAGNETIC AND BATHYMETRIC PROFILES 10-11 10 5 (°) 10 20. 30 ("HHH 5 asuticat mies Sy 23 NOV. ‘61 MICHELSON 23 NOV. ‘61 \ MICHELSON \ an un So f=) SVWWYS NI ALISN3LNI DSULINOVW 1VLOL a ° ° to} ALISNALNI SILANOVW 1VLOL a °o on So i=) SWOHLV4 NI Hid3d SWOHLV4 NI Hid3ad on un So fo} SvWWv9 NI nn fo) on So So g = 2 7 51000 fay Z fa Zz a 2 ALISN3LNI DIINOVW 1VLOL BOWDITCH SEA LEVEL SWOHLV4 NI H1d3G SWOHLV4 NI Hid3d SVWWYS NI ALISN3LNI SILINDVW 1VLOL ALISN3LNI SILINOVW_1VLOL SWOHLV4 NI Hid3d SWOHLV4 NI Hid30 FIGURE 22.— MAGNETIC AND BATHYMETRIC PROFILES 9-10 10 5 te) 10 20 30 CHEE NAUTICAL MILES 33 23 NOV 0300 DUTTON 23 NOV. ‘6) DUTTON 0600 0500 0400 0300 if dh 23 NOV. 6) | BOWDITCH 0700, 0600 0500, 0400 /\ 0300 ‘ 23 NOV. ‘61 23 NOV. 61 MICHELSON MICHELSON YON 1 Row WwlOl SvWWY9 NI YW_IVLOL ALISNALRN St SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI Hiddd = fo) g > z = > (a) Zz > = oO AZ z a Z g 2 BOWDITCH SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI Hidad wo on ° fo) SVWWY9_ NI ALISN3LNI_ SILINOVW_IWLOL SvWwWwYd Ni ALISN3LNI DILINOVWW IVLOL SWOHLV4 NI Hild3d SWOHLV4 NI H1id3d FIGURE 23.— MAGNETIC AND BATHYMETRIC PROFILES 8-9 10 fe} 10 20 30 Sa | NAUTICAL MILES 34 7 c DUTTON 0400 _——s a ee—F 23NOV. 6) 0300, 9760 ‘ | 1900 DUTTON | th 2000 ] 22_Nov. 6) BOWDITCH (0400 | 100 x | | 23 NOV. 61 0: 6200 BOWDITCH | | 1900 7 7 NOV. ‘61 a /\ : : - MICHELSON 23 NOV. '6) | 0300 MICHELSON IaNOVW 1V1OL v. ALISNALNi ¥ SVWWV9 NI ALISNALNI SILINDVW_IVLO SEA LEVEL SWOH1V4 NI H1d3d SWOHLYV4 NI Hidad 51000 ) a > - Z> (9) Z. a oO Z VWWYD SVWWY9_NI ALISNALNI SILINOVW 1VLOL BOWDITCH SWOHLV4 NI Hid3d a $ 3 > > 5 51500 — ZS = lad @ >e ior4 3 5100 pau zo 28 nz az m 50500 m 74 Zz & gz 3 3 g g 3 7 =x —_ z Z nm > Z a 9 és n FIGURE 24.— MAGNETIC AND BATHYMETRIC PROFILES- 7-8 20 30 = es — oe — JI NAUTICAL MILES 35 22NOV. 6) DUTTON 1100 22NOV_ 61 BOWDITCH 7200 | | I 1 a ———_—— ee 1200) 1100 | 22Nov" ‘61 MICHELSON 63° LOL SVWWY9 NI ALISN3LNI SILINDVW_ IV. N ALISN3LNI DILINODVW 1VLOL SEA LEVEL SWOHLV4 NI Hiddd SWOHLV4 NI Hidad = fe) a] > - 2 exe) Baz =m se! bo a= Z =] m Z a = = SVWWY9 NI ALISN3LNI SILAZNOVW 1VLOL BOWDITCH o SWOHLV4 NI Hid3d cS) fo} ro} SWOHLV4 NI Hid3d oO un So o SvWwWYS NI NalNI DIINOVW IVLOL a So ro) ro) f=} SYWWY9 NI ALISNSLNI SILANOWW_IVLOL ALIS! SWOHLV4 NI Hid3d SWOHILV4 NI Hid3G FIGURE 25.— MAGNETIC AND BATHYMETRIC PROFILES’ 6-7 10 5 1°) 10 20 30 SSE a INAUTICAD MILES 36 0100 22 NOV ‘61 BOWDITCH 22.NOV. ‘61 BOWDITCH | es , —_—_—_— 0100 | a 22 NOV. ‘61 1200 | n MICHELSON 22 NOV. ‘61 MICHELSON = 4 : 5 5 4 q a Zz Zz EA nm & & =| 2 Zz Zz ® Q : : Oo >m zz &z = Q 2 3 i) Zz a (a) 2 z Q : BOWDITCH SEA LEVEL SWOHLV4 NI Hid3G SVWWYS NI ALISN3LNI SILINOVW 1VLOL ISWOHLV4 NI H1d3G FIGURE 26.—MAGNETIC AND BATHYMETRIC PROFILES 5-6 1 5 10 30 NAUTICAL MILES 37 pores |) 09 1400 1300 lov |z NOV. ‘61 22 BOWDITCH BOWDITC 6 «| | MICHELSON | 160015001400 ——— ,2/ NOV. 61 | lia o700___— 22 Nov. ‘6!| MICHELSON | wn fo} °o fo} un to} So fo} SVWWY9_NI ALISN3LNI SILINOVW IVLOL 3 a o oO a to} a to} fo} SVWWYS NI ALISN3LNI_ SILINDVW_IWLOL a o So fo} Lo} un oO fo) So °o SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 Ni H1ld3ad SvVWWYS NI ALISN3LNI SILINDVW_1VLOL SVWWY9_ NI 4 O° = > - = > o Z 7 = oO Z Ss m Z @ 3 ~< BOWDITCH SWOHL1V4 NI Hid3d0 SWOHLV4 Ni Hidad an °o So oO svwwvd NI ALISN3LNI DILINDVW IVLOL Bee 33 o n fo} °o to} fo} ALISN3LNI_SILINDVW_TVLOL SWOHLV4 NI Hid3d SWOHLV4S Ni Hid3ad FIGURE 27.— MAGNETIC AND BATHYMETRIC PROFILES 4-5 10 5 ie) 10 20 30 6 so NAUTICAL MILES) 38 Ww 5 1900_ 0900 se) | 0709___0600 oe 2500 00 t = 0300 Nov 6! BOWDITCH 0 0200 __0100 [0c 7300 21 NOV. 61 MICHELSON SVWWY9 NI ALISN3LNI DILINOVW 1VLOL a fo} fo} o o DUTTON SEA LEVEL SWOHLV4 Ni Hid3d SWOHLV4 NI Hiddd wn fo} fo] o SVWWYD NI ALISN3LNI SILINDVW_1VLO. sSvwwv9d Ni a ° Si > = = > (2) re m = a Zz iS m Z un =| 2 BOWDITCH SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d OL svwwvod NI ALMSNALNI SILINOVW_1WLOL SVWWY9 NI ALISN3LNI SILINODVW IVL a fo) a fo} fo} on fo} fo} oO o SWOHLV4 NI Hid3d SWOHLYW4 NI Hidad FIGURE 28.—MAGNETIC AND BATHYMETRIC PROFILES 3-4 10 5 (°) 10 20 30 SS a i I NAUTICALEMILES, 39 —————— 2300 ‘00 2100 20 NOV. 6] DUTTON ————_— ——_—_— 20 NOV. 61 20 NOV. 6! | BOWDITCH BOWDITCH | | 5 ——— 1400 1300 20 NOV. ‘6! 2200 20NOV. ‘6! | MICHELSON MICHELSON | an So °o SVWWV9 NI ALISN3LNI DILINDVYW IVLOL ad a 3 = 3 8 SVWWY9 NI ALISN3LNI_ SILINDVW_1VLOL SEA LEVEL SWOHLYV4 NI Hid3d SWOHLV4 Ni Hid3d wn un fo] to} Svwwvd Ni a ro) Q fo} fo} ALISN3LNI_ SILINDWW_1VLOL = ° a > = = > g 51000 fa) Z m Z & 3 TCH Bowells SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 Ni Hid3d NO MAGNETIC DATA sSvwwvd Ni ALISN3LNI SILINOVW IVLOL SvVWWYSD NI ALISN3LNI SILINDVW 1VLOL MICHELSON SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI H1ld3d FIGURE 29.— MAGNETIC AND BATHYMETRIC PROFILES 2-3 10 5 (¢) 10 20 30 = =o: a — a — or ——— Oo 40 1490. 20 NOV. ‘6) DUTTON ——/ 0500 0430 20NOV. ‘61 DUTTON Si ——— ee ee : —__— - —. 0300 1400 Op 1000 4 0400 30 NOV. ‘61 20 NOV. 61 BOWDITCH R BOWDITCH 0400 +5500 20NOV 6! MICHELSON SVWWY9 NI ALISN3LNI SILINOVW_1VLOL SVWWY9 NI ALISN3LNI SILINOVW 1VLOL SEA LEVEL SWOHLV4 NI Hid3d SVWWYD NI SVWWY9 NI ALISN3LNI SILENOVW 1VLOL —NO MAGNETIC DATA— 3 4 > = (2) 74 m =! fo) ez: m Zz in 2 BOWDITCH SWOHLV4 NI Hidad n un fo) io} NO MAGNETIC DATA SVWWY' ALISN3LNI DILINDVW 1VLOL i) fo} un to} o MICHELSON. SEA LEVEL SWOHLV4 NI Hid3d FIGURE 30.— MAGNETIC AND BATHYMETRIC PROFILES 1-2 10 5 Ce} 10 20 0 NAUTICAL MILES 41 SWOHLV4 NI Hidad SWOHLV4 NI Hiddd a fo} 3° oO SVWWY9D NI ALISNALNI SILINOWW TWLOL SWOHLV4 Ni Hiddd 1 epoprperyecmiemtemae hn gy ely dg ‘phim ind ea : omen: Rai ; ‘ j * = ‘ } ee: ; Ee ' aay tou i eo ant ' Saal maa ii 1 \ ’ t - i i 2 i 7 1 i lp : bs stdin : - cal arent ito : ; : a Nv " ied ma i en si a “peat intn! AMES: AAMT emer ei par imme ig : ° — a on . ie Ror “hes fe i f . its . A 82, roti See mets ; ee a RTE | ri eH a eT ing i 5 ee ‘ = Sealers to ttoniecormmanrtnn na jwleliceeiet SAR ie eee ella ss ¥ Apher ite : Y (x ih re ' nanten eeeainete ts) sy Oa an PART II: NEW YORK - NORWEGIAN SEA (FIGS, 31-60) 43 GREENLAND CANADA NEW BRUNSWICK USNS BOWDITCH USNS MICHELSON FIGURE 31.— PROFILE INDEX NEW YORK—NORWEGIAN SEA 44 SHETLAND ISLANDS ? NORTH SEA 55 FRANCE ALGERIA 5° 45 ALIAILDV DILANOVWNOASD JO SSADIGNI-N— ‘Z2E AYNSIA GNVW1I9SNS ‘ONV1ILYVH K-INDEX VINIDYIA ‘SYeYngsynoiWagayY4s GEORGES |BANK BOWDITCH} —NO MAGNETIC DATA— BOWDITCH SEA LEVEL LYDONIA CANYON SWOHLV4 NI Hid3d SWOHLV4 NI Hidad —NO MAGNETIC DATA— SEA LEVEL SVWWV9S NI ALISNALNI DILINOVW TVLOL SVWWYV9 NI ALISNALNI DILINDVW IVWLOL SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d FIGURE 33.— MAGNETIC AND BATHYMETRIC PROFILES 30-31 10 5 O 10 20 30 a 47 BOWDITCH 4 MAR. 62 DUTTON 4 MAR, ‘62 BOWDITCH 3 g > z z > a Z a = Z m Z @ 2 Z Q > = ES > un SEA LEVEL SWOHLV4 NI H1d3d SWOHLV4 Ni H1d3d —NO MAGNETIC DATA— SEA LEVEL SWOHLV4 NI H1d3G SWOHLV4 NI Hid3d FIGURE 34.— MAGNETIC AND BATHYMETRIC PROFILES 32-33 10 5 10 20 30 (ARH Nautical mites 48 BOWDITCH 4 MAR. ‘62 0100. a» ao fo) i=) nn r< fo) So °o on a wn fo} o un o So to] fo} BOWDITCH SEA LEVEL SVWWYV9 NI ALISN3LNI SILNOWW 1VLOL = ° = > = ca) Z ™ = (a) Zz am Zz an 2 Z : un SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d —NO MAGNETIC DATA— SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI Hid3ad FIGURE 35.— MAGNETIC AND BATHYMETRIC PROFILES 33-34 10 5 0 10 20 30 (“RRR E=t ET NavTIcAt mites 49 BOWDITCH 5 MAR, ‘62 BOWDITCH SEA LEVEL SVWWYVS NI ALISN3LNI DJILINOVW IVLOL = ° g > = = > ca) Z | fa) Z m Zz 2 2 Zz Q > : n SWOHLV4 NI Hid3d SWOHLYV4 NI Hid3d —NO MAGNETIC DATA— SEA LEVEL SWOHLV4d NI Hid3d SWOHLYV4 NI Hid3ad FIGURE 36.— MAGNETIC AND BATHYMETRIC PROFILES 34-35 10 5 0 1 20 NAUTICAL MILES wn > fo} fo} fo} wn wo Hn So °o un ao So So fo) —NO MAGNETIC DATA— un nN un fo) io} a <) So fo] fo} a Nv fo} tS) SVWWYV9 NI ALISN3LNI SILINOVW 1VLOL = fe) a] > = o Z a fa) Z m Z Ze 2 Z : (7 wn un fo) fo) un nn °o °o BOWDITCH SWOHLV4 NI Hid3d SWOHLV4 NI H1ld3ad —NO MAGNETIC DATA— SVWWY9 NI ALISN3LNI DILINOVW IVLOL SVWWYV9 NI ALISNALNI SILANOVW TVLOL SWOHLV4 NI H1d3ad SWOHLV4 NI H1ld3d FIGURE 37.— MAGNETIC AND BATHYMETRIC PROFILES 35-36 10 _ 5 (°) 10 20 30 (BRE Ef Et EF nautica mies —NO MAGNETIC DATA— BOWDITCH SWOHLV4 NI H1ld3d ISWOHLV4 NI H1id3ad a4 =a g g > > = fe = = > > (a) (a) Z Zz m m = 2 Ta) fa) z 53500 > m m 72 Z w a 2 53000 2 Z Z $ 52500 © z = S 3 un un 52000 ie] ie) m m 3 =| e. as Z Z mu ul > > i — as es fe) ° = = un Q FIGURE 38.— MAGNETIC AND BATHYMETRIC PROFILES 36-37 10_ 5 O 10 20 30 (HARE Nautical mites De 1500 ——— 500 RENDEZVOUS ——— 0300 5s 0200 Bn, © Ee BOWDITCH ——— 700 ——9.400 7 MAR. ‘62 DUTTON on > ° S$ wn ao un So o wn eo So So o —NO MAGNETIC DATA— Cee —NO MAGNETIC DATA— BOWDITCH = fe) g > = (a) Z q (a) Z m Z @ 2 Zz : an SWOHLV4 NI Hid3d SVWWYV9 NI ALISN3LNI DILINDVW 1VLOL SWOHLYV4 NI H1d3G SVWWYV9 NI ALISN3LNI SILINDVW IVLOL SVWWV9 NI ALISN3LNI SILINDVW 1VLOL SEA LEVEL SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d FIGURE 39.— MAGNETIC AND BATHYMETRIC PROFILES 37-38 10 5 Com NAUTICAL MILES 53 BOWDITCH 0300 7 MAR. 62 DUTTON | nn wo °o fo) fo} nn nN wo fo} o wn id So ° o NO MAGNETIC DATA— wn uw °o o = ° g z = > (a) Z m = fa) Z 4 m Z Z 2 z (a) : an SVWWYSD NI ALISN3LNI DJILINDVW IVLOL BOWDITCH SWOHLV4 NI Hid3d SWOHLV4 NI Hid3d SVWWVS NI ALISN3LNI SILANOVW IVLOL SVWWY9S NI ALISN3LNI SILINOVW 1VLOL SWOHLV4 NI Hid3G SWOHLV4 NI H1ld3d0 FIGURE 40.— MAGNETIC AND BATHYMETRIC PROFILES 38-39 10 5 ) 10 20 30 oo — 54 —NO MAGNETIC DATA— BOWDITCH SEA LEVEL g > > 7) Z i] a z Fi 74, cn 3 z (a) : > on SVWWYV9 NI ALISNSLNI DILINOVW 1VLOL SWOHLV4 NI Hiddd SWOHLYV4 NI Hidad SVWWV9 Ni ALISN3LNI DILINDVW IWLOL SVWWY9 NI ALISNJLNI DILINDVW IVLOL SWOHL1V4 NI Hid3d SWOHLV4 NI Hid3q FIGURE 41.— MAGNETIC AND BATHYMETRIC PROFILES 39-40 10 5 O 10 20 30 NAUTICAL MILES 55 Vo Spy, | / | BOWDITCH] ( BOWDITCH 8 MAR. 62 B MAR. 62! ee a Se I 1500 > 0 / 0500 0600 ye os00.2~*«‘“S*~S Saree 2a Se a eT : é 7 3500 0600 0700 ela he i a oe 1300 ——~—~~«*1400 8 MAR 62 DUTTON 4 | ae Airy | | Ie 530, a O50 ! y ny = 3 64 > 7 z z (a) (a) Z 52000 52000 4 = a (a) fay ES Z FE 51500 51500 4 & & 2 2 = 51000 51000 = Z Z 3 BOWDITCH Q z c SEA LEVEL lo z > on 500 a z = Z Z z z —NO BATHYMETRIC DATA— z fe} & & = 3 6 «AO g iS fe 2 52000 = : 5 fa) Z Z 515004 51500 = a oO — es Z Z 51000 51000 wt m Z é g = 2 2 505004 50500 > Z (a) Q DUTTON z 0 SEA LEVEL ———__________—+-0 % 5004 500 % 1000 4 a 1500 % 3 x x 2000 = z 2500 -» mn Ea 3 3000 = Q 3500 & 7) FIGURE 42.— MAGNETIC AND BATHYMETRIC PROFILES 40-41 5 (°) 10 20 30 fe: oe —— 56 | | | BOWDITCH B MAR. 62 BOWDITCH SVWWYV9 NI ALISN3LNI SILINDVW IVLOL fo) =a > od o Z a oO Zz m Z cn 2 72 9) > : SEA LEVEL SWOHI1V4 NI Hid30 SWOHLV4 NI Hid3q SVWWYVS NI ALISN3LNI SILINDVW IVLOL SVWWY9 NI ALISN3LNI SILINDVW IVLOL SWOHLV4 NI Hid30 SWOHLV4 NI Hid3d FIGURE 43.— MAGNETIC AND BATHYMETRIC PROFILES 41-42 1 5 oO 10 20 30 PERE =f EES nautical mites 57 BOWDITCH 8 MAR. 62) 2300 --§ ===. 55 SS hes 2300 Guy) LaMar. '62| 4 DUTTON BOWDITCH SEA LEVEL SVWWVSD NI ALISNALNI DSILANOVW IVLOL = i} > z Fs > o Zz m 3 fa) Z m Zz & 2 Z : 5 SWOHLV4 NI HiddG SWOHLV4 NI Hid3ad SVYWWVS NI ALISNSLNI SIINOVW IWLOL SEA LEVEL SVWWY9 NI ALISN3LNI SILINDVWW IVLOL SWOHLV4 NI Hid3d SWOHLV4 NI H1d30 FIGURE 44.— MAGNETIC AND BATHYMETRIC PROFILES 42-43 10__5 1 30 NAUTICAL MILES 58 a3 | | | | BOWDITCH 1 Tegel 9 MAR 14901590. 1600 1700 1800 16001700~«21800~=«7+900~=~«CD ~~ 100-2200 [}2aMAak 62 DUTTON ' BOWDITCH SEA LEVEL 3 g Pa 3 ® Z 3 (ay Z mM Z g | Z Q ; SVWWV9 NI ALISN3LNI DILINDVW IWLOL SWOHLV4 NI Hid3G SWOHLV4 NI Hid3d SVWWYD NI ALISNALNI SILINOVW IVLOL SVWWY9 NI ALISN3LNI DILINDVW IVLOL SWOHLV4d NI Hid3d SWOHLV4 NI Hid30 FIGURE 45.— MAGNETIC AND BATHYMETRIC PROFILES 43-44 10.5 oO 10 20 10 [ HHH Sy NAUTICAL MILES 59 BOWDITCH 10 MAR. 62 SO 3b sg eo 1500 —— + | | . —_——. ——— . —— — 12 7300 au <00 era 23000000 0100 02000300 aad 000 040007000800 a0 1006 110871206 1300 7400 1500 7800 1900 —NO MAGNETIC DATA— SS —NO MAGNETIC DATA— BOWDITCH SEA LEVEL SVWWYS NI ALISNSLNI SILAZNOVW TWLOL = g > z z > o Z m 3 oO Z m Zz G 2 Z Q > : in —NO BATHYMETRIC DATA— SWOHLV4 NI Hid3d SWOHLV4_ Ni H1d3d SVWWYV9 NI ALISN3ILNI SWINOWW 1VLOL SVWWY9 NI ALISN3LNI SILANOVW 1VLOL SEA LEVEL SWOHLV4 NI Hida SWOHLV4_Ni_H1ld30 FIGURE 46.—MAGNETIC AND BATHYMETRIC PROFILES 44-45 1 5 oO 10 ‘0. 30 NAUTICAL MILES 60 ' 1400. 7 gy ye po T 1500 400 700 1800 re ee ee f >, £10 MAR od D200 a oa - DUTTON JOWDITCH SEA LEVEL SVWWY)D NI ALISN3LNI DILINOVW 1VLOL 3 g > fs i) Z m a fa) Z a Z & 2 Z Q : > n SWOHLV4 NI H1d30 SWOHLV4 NI H1d3q SEA LEVEL SVWWY9 NI ALISNALNI SILINOVWW IWLOL SVWWYV9 NI ALISN3LNI DILINODVW 1VLOL SWOHLV4 NI Hid3d SWOHLV4 NI Hidad FIGURE 47.— MAGNETIC AND BATHYMETRIC PROFILES 45-46 Tomes mao) 10 20 30 (HAA nautica ices 61 : 0000 12 MAR. ‘62 BOWDITCH BOWDITCH SVWWYD NI ALISN3LNI SILINOVW 1VLOL) = ° I > - = > (7) Z m =! (ay Z m Z en 2 Z 4) > = = > a SWOHLV4 NI H1id3d SWOHLV4 NI Hidad SVWWYV9 NI ALISN3LNI SILINOVWW 1VLOL SVWWY9 NI ALISN3LNI SILINOVW 1VLOL SWOHLV4 NI H1ld3d SWOHLV4 NI H1d3d FIGURE 48.— MAGNETIC AND BATHYMETRIC PROFILES 46-47 10 5 i) 10 20 30 a 2 0 a ——— eS ee = PY Ca 62 ST = 0 Vs oe oy ol [°) S ol 8y-LyV S3a1I5cO0Ou4d DIMLAWAHLVE GNV DILANOVWNW — ‘6% 3YNSIA DEPTH IN FATHOMS DEPTH IN FATHOMS HDLIGMO8 TOTAL MAGNETIC INTENSITY IN-_ GAMMAS 63 HOLIQMO8 29. “av LL 0010 0000 O0EZ oezz oos0 7 SE 0 eee 00 (Ones 000) z 08 HLIGMOB8 90 _-o MNVE ABTIVE YaLNO DEPTH IN FATHOMS SITY TOTAL MAGNETIC _INTEN S31IW TVILNVN oe OL S ot 6y-8~ S3TIAOU¥d DIYLAWAHLVE GNV SILANOVAN 13A31 vas — ‘os 3ynNDSI4 HDLIGMO8 00z1 ; DEPTH IN FATHOMS NSITY IN_GAMMAS TOTAL MAGNETIC INTE! HILIGMO8 9. AVWZL 64 saw WL SAA) o€ 0z Ol SF om OS-6R S3T1ISOUd DIYNLAWAHLVE OGNV DILANOVWN —'1IS 34yunNDIS DEPTH_IN_FATHOMS ‘T3A31 WIS San H Zo 43gdyOD3a FHL YOI dJ31S OOL F4V SINFIGVID iw = fe) BS - < uw z PS & wi a 2 = < 10) z z 72) Zz = z Y o Z rU) < > 3 < - (e) = TOTAL _MAGNETIC_INTENSITY_IN_GAMMAS Feonvisid hc AANWYO | | | | JAIAUNS JO GNF, HDLIGMO8 | . z9. dvW EL 0001 mm 0 B00 — 10 + | HLIGMOg ~————___2000 29. “awe, 0682 65 DEPTH IN FATHOMS 3 < 10) z z a Zz f= Zz y 7 Z 3 x = fe) - NOST3HIIW S31IW IVOILNVN 0 ol OL 2@S-lS S3A1IdO¥d DIMLAWAHLVG GNV SILANOVW —'2S 3ynNDdI4 ° So re) - Ps) o [= {=} N » i=] So o aX Pe) | ostanony 29. ayW > * 0020 DEPTH IN FATHOMS OTAL MAGNETIC INTENSITY IN GAMMAS 66 sm Wounvn Et R) o€ 0z ol o Ss Ol €S-2¢SG SAMNAOYd DIMLAWAHLVE GNV CILANOWN —'‘€sS 3yNdIs DEPTH IN FATHOMS DEPTH IN FATHOMS fo) f=) fo} to} rey ° ° °o re) ° fo} wo OTAL MAGNETIC INTENSITY IN GAMMAS 3 = < 10) z is 77) Z w E z Y - w Z oO < = < ~ ie) = 3| NOSTIHIIW zo, YvW S 0002 ea e008! 00! 67 i oe es | o€ oz ol 0 ¢ Ol vS-€SG SA1NAO4d DINLAWAHLVE GNV DILANDVW — VS 3eNdIs DEPTH IN FATHOMS DEPTH IN FATHOMS 1 V: SOSA NOS73HSIW viva JILINDVW ON n” < = = < oO Zz is ” Zz # zZ Q ir Z 3 = x = Q TOTAL MAGNETIC INTENSITY IN GAMMAS NOS73HOIW 79. -avW S 0 008! NOST13HIW 29. “SW 9. ool 68 S31IW IDILAVN ae = oe 0! ol t 9S-SS GNVSS-7S S3TIAOYd DINLAWAHLVE ONY SDILANOVW —'SS 3ynNdIA DEPTH IN FATHOMS DEPTH IN FATHOMS DEPTH IN FATHOMS DEPTH IN FATHOMS 13A31 VIS NOSTIHDIW —Vivd dILINDVW ON— ” “” = < 3 3 < < 0) () z z S z ” ” Zz 74 E z Zz Zz ) ) - = w w 74 Zz 3 3 x < - E {e) e} 79. SWW Z o0e! \ Ol JAOH NOS13H3IW | eo : 1 NOS?3HIIW NOS73HIIW ad NOST3HIIW Xa z9. AY 9 yf 29, AWW 9 00IZ. = 0060 | 7 ‘ 2 & y NISVa GNVIGNNOAMAN DEPTH IN FATHOMS S31W 1VDILNYN == —s “—-=, HHA _J o£ 0z ot (OSOL Z£S-9S SAMNAOYdd DIYLAWAHLVE GNV DILANSWW —'9S 3ayNDdIA — 13A31 vas —V1Vd DILINDVW ON— 008l 0021 0091 eS . _—_— 01 NOSTIHSIW. 051 00rt 00eL 0021 NOST3HOIW zo. aw Z 0001+ oolt DEPTH IN FATHOMS 70 DEPTH IN FATHOMS 7) < = = < 10) z = 72) Z = z Y - w Z 3 = < — 2 saw WolLAVN = I __—1 FEE} Ob () O FOL 8S-L£S S3A1NAONd DIYLAWAHLVE GNV SILANSVN 19A31 vas viva —'£S 3ygndSI4 SILINSVW ON —. ; —V1LVd JILINDVW ON— INNOWVAS YIVL1V DEPTH IN FATHOMS NOS13HIIW TOTAL MAGNETIC INTENSITY HN GAAMAAS za Narol 29, YW 6 0020 _———— 00, | | Wl saw 12ILnvN E= TA of 0z OL OS Ol 6S-8S S31IdO¥d DIYLAWAHLVE GNV SILANOVW —'8S 3yNnol4 n = fe) ae = < ras Zz x - a w a n < = = < Oo Zz is a Z [= Zz i - w Z Oo < = Ke ~ fe) ‘TOTAL MAGNETIC INTENSITY IN GAMMAS DEPTH IN FATHOMS NOS73H. 29 rch 55 | wosiaH51W 0091 0051 00F | 00€| ani SS 2) zo. dW 6 [6 002 . acon 0010 0000 N. Op V2 WV, Oh DEPTH IN FATHOMS| N GAMMAS z o Z, rr) ETIC INT! TOTAL MAGN 0060 zy. avw Ol o = 77) Z w = Z Uv = wo ZZ 10) < = a 4 = ie) = S3IW IVDILNWN oe ol OES t 19-09 S31IdO0O'¥d DIYLANAHLVGE GNV DILANOVW —‘'0O9 3yuNdSIl4 DEPTH IN FATHOMS| 19A]31 VAS NOSTIHIIW fo} fo} o n ~~ viva — Jil3jINSVW — ON i=} i=} io} o ~~ ° ro) o = TOTAL MAGNETIC INTENSITY IN GAMMAS N, My 0021 0091 00s! 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