Meaning of 1 prolonged blast every 2 mins
Power driven vessel making way (Vessel >12m long)
Meaning of 2 prolonged blasts every 2 mins
Power driven vessel not making way (Vessel >12m long)
Meaning of 1 prolonged blast and 2 short blasts every 2 mins
Vessel not under command, restricted in ability to maneuver, constrained by draft, sailing, engaged in fishing, engaged in towing/pushing (Vessel >12m long)
Meaning of 1 prolonged blast and 3 short blasts every 2 mins
Towed vessel, or if multiple in tow, last one in the tow (Vessel >12m long)
Meaning of Bell for 5 secs every minute
Vessel at anchor (may also use short, long, short blast to give warning of position. (Vessel >20m long)
Meaning of bell for 5 secs and then gong for 5 secs every minute
Vessel over 100 meters in length at anchor
Meaning of 5 seconds of bell, then 3 distinct strikes of the bell every minute.
Vessel aground (Vessel >20m long)
Meaning of 1 short blast
“I am altering my course to starboard”[international]
“I intend to leave you on my port side”[inland]
Meaning of 2 short blasts
“I am altering my course to port”[international]
“I intend to leave you on my starboard side”[inland]
Meaning of 3 short blasts
“I am operating astern propulsion”
Meaning of 4 short blasts in addition to other fog signal
Pilot vessel engaged in pilotage duty
Meaning of a diamond shape
Power driven vessel when towing and the length of the tow exceeds 200m
Meaning of a cone shape (apex down)
Vessel under sail while also being propelled by machinery
Meaning of two cones (vertical, apexes to center)
Vessel engaged in fishing other than trawling
Meaning of cone shape (apex up)
vessel engaged in fishing with gear extending over 150 meters from the vessel. Shape should in the direction of the gear.
Meaning of one ball shape
Vessel at anchor
Meaning of 2 ball shapes
Vessel not under command
Meaning of 3 ball shapes in a vertical line
Meaning of 3 ball shapes at the top and sides of a cross
Vessel engaged in mine clearance
Meaning of a ball over a diamond over a ball
Restricted in ability to maneuver for reasons other than mine clearance
Meaning of a cylinder day shape
Vessel constrained by draft
When must lights be shown
From sunset to sunrise
[International and Inland] What vessel must have a masthead light forward, a second masthead light abaft and higher than the forward one if longer than 50 meters, and sidelights and a stern light.
A power driven vessel underway.
[International and Inland] What vessel must have an all around flashing yellow light, in addition to the light for a power driven vessel underway?
An air cushion vessel operating in non-displacement mode.
[International and Inland] What vessel must have a high intensity all-round flashing red light in addition to the lights for a PDV making way?
A WIG craft when taking off, landing, or in flight near the surface.
[International and Inland] What vessel may have an all round white light and sidelights?
A power driven vessel less than 12 meters in length.