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1.Short blast duration: 1 second
2.prolonged blast duration: 4-6 seconds
3.12m or more sound requirements: whistle
4.20m or more sound requirement: whistle and bell
5.100m or more sound requirement: whistle bell and gong
6.one short blast means: I am altering my course to starboard
7.two short blasts mean: i am altering my course to port
8.three short blasts mean: i am operating astern propulsion
9.intending to overtake another vessel in a narrow channel: 2 prolonged and 1 short: i
intend to overtake on starboard
10. intending to overtake another vessel in narrow channel: 2 prolonged and 2 short:: i intend to
overtake on port
11.intending to overtake is how many and how long?: 2 prolonged
12. How do you signal agreement to be overtaken: 1 prolonged, 1 short, 1 prolonged, 1 short in that
order
13. what is the signal for in doubt?: 5 rapid short blasts. can be supplemented by at least 5 flashes of
light
14. what do you signal if you are approaching a bend and think there may be another boat around
the corner?: signal with 1 prolonged
15.how do you answer around the corner?: 1 prolonged
16. restricted visibility: power vessel making way has to signal this: 1 prolonged every 2 minutes or
more freq
17. power stopped making no way makes this sound in restricted viz: 2 prolonged blasts, 2 second
intervals
18. vessel NUC, RAM, CBD, sailing, fishing, towing or pushing, has to make this souind in restricted
visibilty: 1 prolonged, 2 short
19.fishing at anchor, RAM at anchor (working) makes:: 1 prolonged 2 short
20.a vessel towed or the last vseel of the tow makes this sound in restricted vis: 1 prolonged, 3 short.
preferably as soon as the towing vessel finishes her blasts