What is the minimum sound signaling equipment required aboard a vessel of 100 meters or more in length?

Detailed information on sound-signalling devices and appliances is found in the Collision Regulations. Here are the basic requirements.

Sailboats and powerboats less than 12 metres (39.4 feet) in length that do not have a sound-signalling appliance must carry one sound-signalling device that is audible for at least one-half nautical mile. This includes PWCs.
Sailboats and powerboats 12 metres and up to 20 metres (39.4 feet to 65.6 feet) in length must be fitted with a whistle that is audible for at least one-half nautical mile.
Sailboats and powerboats 20 metres (65.6 feet) or more in length must be fitted with a whistle and bell that are audible for at least one-half nautical mile.

Deck : Rules of the Road - 398/1025
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BOTH INTERNATIONAL & INLAND What is the minimum sound signaling equipment required aboard a vessel 10 meters in length?
A) A whistle only
B) A bell only
C) Any means of making an efficient sound signal
D) A bell and a whistle

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Deck : Rules of the Road - 1649/1025
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BOTH INTERNATIONAL & INLAND At night, you see the lights shown in illustration D078RR below. These lights would indicate which vessel?
A) not under command
B) on pilotage duty and underway
C) restricted in her ability to maneuver
D) engaged in fishing and making way

Illustration D078RR

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