1.4. Conduct of vessels not in sight of one another

Question 1

When does the rules for restricted visibility apply?

Answer 1

When vessels are not in sight of one another navigateing in or near an area of restricted visibility.

Thereby the use of fog signals / electronic devices such as Radar / AIS is the only means of detection.

Question 2

Since section ii of the steering and sailing rules does not apply in restricted visibility what measures are to be followed instead?

Answer 2

1. Vessels still have full responsibility under section i
2. Shall proceed at safe speed adapted to prevailing circomstances and conditions of restricted vis
3. Shall have engine avalable for immediate manuvre
4. ROC / Close-quarters determined by radar alone:

• shall take action in ample time
• Avoid a/c to port for v/l fwd of beam
• Avoid a/c toward v/l abeam or abaft the beam
• I hearing a fog signal fwd of beam
• OR cannot avoid a Close-quarters situation with v/l fwd of beam, slow down to bare sterageway and navigate with extreme caution until danger of collision is over.

Question 3

Radar Plotting

Explain with Plotting Sheet Normal Turns vs Escape Turns when following guidance of Rule 19

Answer 3

Question 4

Radar Plot showing Target a/c, slow down & speeding up

Answer 4