QUESTIONS 261
28. Describe and illustrate tlie uniform system of buoyage with
topmarks if any.
29. What degree of dependence can be placed on buoys, lightships
and., moored beacons?
30. What would you do when entering a port and sight the following
signals ?
(i) Three green lights vertical right ahead,
(ii) Two green lights vertical on starboard bow.
(iii) Four green lights (2 and 2 vertical) right ahead,
(iv) One green flash every 5 seconds on your port bow.
(v) A vessel painted green showing 3 green balls vertical from her
yardarm.
(vi) Three strokes on a deep toned bell on starboard bow.
(vii) Two strokes on bell right ahead,
(vin) Four strokes on bell on port bow.
31 What measure of reliance can be placed on sound signals in fog?
32 What is (i) a "diaphonc" signal, (ii) a "nautophone" signal; (iii)
an "oscillator" signal2
33. Which are the more reliable, air sound signals or submarine
Bound signals?
34. State what you know of wireless fog signals in general.
35. Describe in general terms how W/T bearings are obtained on
board ship from (i) a wireless beacon; (ii) a revolving wireless beacon;
(iii) a rotating wireless beacon.
36. You have made signals of distress to the shore (Article 31),
what do you understand the following reply signals to mean?
(i) A rocket throwing white stars.
(ii) An explosive sound signal showing a white star,
(iii) Two explosive sound signals in succession dropping green stars,
(iv) Three explosive sound signals in succession, 1st a white star,
2nd and 3rd green stars.
(v) A swallow-tailed red flag shown from the shore,
(vi) A triangular red flag shown from the shore.
37. You are compelled to make a landing with the ship's boat on
a beach, what do you understand the following signals to mean when
shown by the coastguards?
(i) A white flare when held steady,
(ii) A flag waved from side to side,
(iii) Two white flares held steady.