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Construction of CapnScurvy's Angle on Bow Calculator 

January 7, 2008 

This calculator has three parts, pages 5, 6, 7 or 8 (page 7 is for imperial use, page 
8 is for metric). The pages should be printed, cut out, and held together with a 
two prong, brass brad fastener. Your printer should be set to its highest printing 
preference, and you should use standard 8.5 x 11 heavy weight card stock paper 
(110 lb is good). Click on the printer icon at the top of this PDF screen, a PDF 
"Print Box" will appear. About half way down find the heading "Page Handling", 
find the item "Page Scaling" and enter "Fit to printer margins" if its not displayed. 
This will insure a correct page size for the calculator parts. Be careful to have the 
three parts lined up correctly when you are making the center whole thru the 
heavy paper. 

Once constructed, use the document included in this PDF (pages 2, 3, and 4) to 
learn how to use the calculator with Silent Hunter 4 Wolves of the Pacific. This 
basic instruction will be good for gamers using the game play elements set to a 
medium low realism, (i.e. Only the "Manual Targeting System" enabled (check 
marked) within the game options. The other options except for "No Map Contact 
Update" can be set to whatever preference you like. The "No Map Contact Update" 
option should be considered when you are ready for a much more challenging 

Another tutorial is available for using the calculator with high realism game play 
settings enabled in Silent Hunter 4. This "High Realism Tutorial" will show you how 
to use the calculator and other tools of the game to find target ship positions and 
headings when both "Manual Targeting System and No Map Contact Update" are 
enabled (check marked) in the game play options. You will learn to plot target ship 
courses, find AoB, and time for speed, all from the Navigation Map. This will 
enable you to plan attacks based on the data you acquire manually. With the 1.4 
patch came the ability to measure in 50 unit increments (yards or meters) rather 
than tenths of nautical miles (202 yards) on the Navigation Map. This will create 
much greater accuracy when manually plotting a targets course. 

See you under the sea. 

CapnScurvy's Angle on Bow Calculator 

Jan. 7, 2008 

The three parts of the calculator are from largest to smallest: 

1 . The Base Wheel 

The blue Arrow along the bottom represents your sub's course heading to the middle Compass Dial. The outer numbers in 
the blue field, represent your view-to-target bearing that can be found at the top of the Binoculars, Periscope, or UZO. 

2. The Compass Dial 

3. The Target AoB Dial 

The black arrow represents the target ship's course heading to the middle Compass Dial. The outer smaller numbers are the 
Angle on Bow indicators. Angle on Bow is the direction bearing of your sub from the target ship's bow, either Port (left) or 
Starboard (right). 

You will need to know three things to make a correct calculation. They are: 

1 . Course heading of the target ship 

2. Your own boat's course heading 

3. The view-to-target bearing 

For this basic instruction, have the game play options of "Manual Targeting System" enabled (check marked) and the "No 
Map Contact Update" disabled (unchecked). To find the target ship course heading, use the Navigation Map to plot its 
course. Along the left side of the map, open the Compass by clicking on it, next click the Ruler. This will give you the 
Bearing-to-North Protractor tool. Click and drag a line through the target ship in the direction of its travel and read the 
bearing that the line intersects with along the BACK edge (closest to the target ship) of the protractor. 

The Orange circle shows 
the Compass icon clicked 
"open". This changes the 
ruler into the Bearing to 
North Protractor. The Green 
circle indicates where you 
read the bearing heading 
for the target ship. In this 
example it's about 112'. 

Your sub's course heading can be read from the Compass of the Quick Controls Panel along the lower 
portion of the game screen. As long as you both keep a steady course, the calculation will be accurate 
until a course change is made by you or the target ship. 

The Yellow circle on the 
left picture shows your 
compass dial. The small 
red arrow points to the top 
center of the dial indicating 
the subs course bearing. 
There are no indicator 
marks along the rim of the 
compass to help in its 
reading. A mod compass 
would be nice to add if it 
has larger bearing 
numbers with indicator 

Your sub's course heading 
can also be obtained the 
same way as the target ship 
by centering the Bearing to 
North Protractor over your 
sub's projected path line and 
reading the value closest to 
the sub. In this example it's 
about 305'. 

To obtain the view-to-target 
bearing or just "target bearing" use 
either the periscope, UZO, or the 
binoculars to site the target. The 
bearing of the target, from your 
sub, will be seen at the top of the 
device. In this example the view- 
to-target bearing is about 328'. 
Now we have the three pieces of 
information to make a calculation. 

Target course bearing=1 12' 
Sub course bearing=305' 
View to target bearing=328' 

Using the illustration below, line 
up the black Arrow of the inner 
Target AoB dial with it's course 
heading of 1 12' onto the Compass 
Dial (the Green circle). Next, while 
moving the two smaller dials 
together, line up the Base Wheel's 
blue Arrow to your boat's course 
heading of 305' with the Compass 
Dial (the Red circle). Now find the 
"view-to-target bearing" of 328' 

along the outer Base Wheel and match it with the inner dial's Angle on Bow degree numbers (the Blue arrow along the lower 

right, drawn to the inner dial at about the 2 Port mark). The AoB bearing is about 20' Port. 

The AoB will change with the 
movement of both ships, so keeping 
the blue Base Wheel "view-to-target 
bearing" moving with the target ship is 
a good idea. "Locking" the in-game 
view is advised, however you should 
use caution regarding leaving your 
periscope up for too long. There is a 
chance of being spotted, causing the 
target to take evasive action. No 
need to move the dials unless a 
course change occurs between the 

You can also get AoB info for future 
firings by using the navigation map to 
draw out your subs future planned 
course heading. As long as the target 
dosn't change course, you will not 
need to move the inner dial. By 
moving the blue Arrow to your new 
course, you will see what the future 
AoB will be. 

Happy Hunting ! 

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Speed Calculations 

Time Target Ship 



Round Off 

Yards Traveled 

by lOOth's 

equal Knots 

i.e. 400y=4kn 



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Speed Calculations 

Time Target Ship 



Round Off 

Meters Traveled 

by lOOths 

equal Knots 

.e. 500m=5kn