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Questions and Answers
Match the following vessel lengths with their corresponding sound signaling devices:
< 12m = some type of sound signaling device < 100m = whistle and bell
= 100m = whistle, bell, and gong any length = no sound signaling device required
Match the following maneuvers with their corresponding whistle signals:
Altering course to starboard = one short blast Altering course to port = two short blasts Operating astern propulsion = three short blasts Stopped = no whistle signal required
Match the following terms with their definitions according to Rule 32 of Collision Regulations:
Whistle = Any sound signalling appliance capable of producing the prescribed blasts Short blast = A blast of from four to six seconds' duration Prolonged blast = A blast of about one second's duration Gong = A signal exchanged by a power-driven vessel and another vessel
Match the following equipment with their respective uses:
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Match the following vessels with their required sound signal equipment according to Rule 33:
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Match the following statements with their correct explanations:
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Match the following signals with their descriptions according to Rule 32:
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Match the following terms with their descriptions according to Rule 33:
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Match the following vessel lengths with their respective sound signaling requirements:
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Match the following whistle signals with their respective meanings:
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Match the following situations with the sound signals used according to Rule 34:
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Match the following vessels with their additional sound signal equipment according to Rule 33:
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Match the situations with the corresponding sound signals in restricted visibility:
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Match the signals with the corresponding vessels in restricted visibility:
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Match the vessels with the corresponding signals in restricted visibility:
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Match the signals with the corresponding descriptions in restricted visibility:
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Match the situations with the corresponding additional signals in restricted visibility:
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Match the vessels with the corresponding parts of the vessel where the bell is sounded in restricted visibility:
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Match the following vessel lengths with their corresponding sound signal intervals:
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Match the following vessels with their sound signal obligations:
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Match the following sound signals with their vessels:
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Match the following situations with their sound signal requirements:
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Match the following vessels with their sound signal exemptions:
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Match the type of vessel with the sound signal it should make in restricted visibility:
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Match the type of vessel with the sound signal it should make in restricted visibility:
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Match the type of vessel with the sound signal it should make in restricted visibility:
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Match the type of vessel with the sound signal it should make in restricted visibility:
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Match the type of vessel with the sound signal it should make in restricted visibility:
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Match the type of vessel with the sound signal it should make in restricted visibility:
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Study Notes
Sound Signaling Devices
- Vessels under 12 meters - Whistle, bell
- Vessels 12 meters or more - Whistle, bell, and a "shape suitable for day signaling" (often a flag)
Whistle Signals
- One short blast - "I am altering my course to starboard"
- Two short blasts - "I am altering my course to port"
- Three short blasts - "My engines are going astern"
Rule 32 Terms
- "Sound signals" - Any audible signal used to communicate between ships, including whistles, bells, gongs, and fog horns.
- "Short blast" - A signal of approximately one second duration.
- "Prolonged blast" - A signal of approximately four to six seconds duration.
Sound Signal Equipment
- Whistle - Used to communicate between vessels and in restricted visibility conditions
- Bell - Used in restricted visibility conditions
- "Shape suitable for day signaling" - A flag or other device used for communication during the day
Vessels and Sound Signal Equipment
- Vessels under 12 meters - Must have a whistle and a bell
- Vessels 12 meters or more - Must have a whistle, a bell, and a shape suitable for day signaling
Sound Signal Explanations
- Short blasts - Used to indicate a change in course
- Prolonged blasts - Used for various purposes, such as warning of danger or indicating a vessel's location
Situations and Sound Signals
- Making way - Two short blasts
- Not under command - Three short blasts
- Underway and engaged in fishing - Five short blasts
- Vessel constrained by her draught - One prolonged blast followed by two short blasts
Restricted Visibility Situations and Sound Signals
- vessel proceeding at low speed - "slow .. " followed by a prolonged blast
- vessel stopped and making way - "stopped .. " followed by prolonged blast
- vessel making way and unable to observe direction - "not observing .. " followed by prolonged blast
- vessel not under command - "not under command .. " followed by prolonged blast
- vessel constrained by her draught - "constrained by her draught .. " followed by prolonged blast
- vessel aground - "aground .. " followed by prolonged blast
Vessel Length and Sound Signal Intervals
- Vessels under 12 meters - One short blast for each second
- Vessels 12 meters or more - Two short blasts for each second
Vessel Sound Signal Obligations
- Vessels making way - Must sound their whistles
- Vessels not under command - Must sound their whistles
- Vessels constrained by their draught - Must sound their whistles
Sound Signal Vessels
- Vessels under 12 meters - Use a whistle and bell
- Vessels 12 meters or more - Use a whistle, bell, and shape suitable for day signaling
Situations and Sound Signal Requirements
- Vessels approaching each other head-on - Both vessels should sound short blasts to signal their intent to pass port-to-port
- Vessels overtaking another vessel - The overtaking vessel should sound short blasts to indicate their intent to pass
- Vessels changing course - Should sound short blasts to indicate their intended new course
Vessel Sound Signal Exemptions
- Vessels at anchor - Not required to sound whistles unless there's a danger of collision
- Vessels fishing - May use "fishing gear in use" signals instead of general whistle signals
Vessel Type and Sound Signal in Restricted Visibility
- Vessels underway - "slow" or "stopped" followed by a prolonged blast
- Vessels not under command - "not under command" followed by prolonged blast
- Vessels constrained by draught - "constrained by her draught" followed by prolonged blast
- Vessels aground - "aground" followed by prolonged blast
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Description
Learn about sound and light signals in accordance with Rules 32-35, including vessel equipment requirements, maneuvering and warning signals, and definitions.