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Subelement A
Rules & Regulations
Section 3
Watchkeeping
Radio watches for compulsory radiotelephone stations will include the following:
  • VHF channel 22a continuous watch at sea.
  • 121.5 MHz continuous watch at sea.
  • Correct Answer
    VHF channel 16 continuous watch.
  • 500 kHz.
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All compulsory equipped cargo ships (except those operating under GMDSS regulations or in a VTS) while being navigated outside of a harbor or port, shall keep a continuous radiotelephone watch on:
  • Correct Answer
    2182 kHz and Ch-16.
  • 2182 kHz.
  • Ch-16.
  • Cargo ships are exempt from radio watch regulations.

VHF Channel 16 is the international distress, safety, and calling channel. The VHF frequencies typically provide shorter range communications out to about 50 miles (depending on antenna height).

2182 kHz is Medium Frequency (MF) equivalent of VHF Channel 16. Frequencies in this range typically provide longer range communications.

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What channel must all compulsory, non-GMDSS vessels monitor at all times in the open sea?
  • Channel 8.
  • Channel 70.
  • Channel 6.
  • Correct Answer
    Channel 16.
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When a watch is required on 2182 kHz, at how many minutes past the hour must a 3 minute silent period be observed?
  • Correct Answer
    00, 30.
  • 15, 45.
  • 10, 40.
  • 05, 35.
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Which is true concerning a required watch on VHF Ch-16?
  • It is compulsory at all times while at sea until further notice, unless the vessel is in a VTS system.
  • When a vessel is in an A1 sea area and subject to the Bridge-to-Bridge act and in a VTS system, a watch is not required on Ch-16, provided the vessel monitors both Ch-13 and VTS channel.
  • It is always compulsory in sea areas A2, A3 and A4.
  • Correct Answer
    All of the above.
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What are the mandatory DSC watchkeeping bands/channels?
  • VHF Ch-70, 2 MHz MF DSC, 6 MHz DSC and 1 other HF DSC.
  • Correct Answer
    8 MHz HF DSC, 1 other HF DSC, 2 MHz MF DSC and VHF Ch-70.
  • 2 MHz MF DSC, 8 MHz DSC, VHF Ch-16 and 1 other HF DSC.
  • None of the above.

Remember, VHF Ch-70 is a Digital Selective Calling channel.

8 MHz HF DSC
1 other HF DSC
2 MHz MF DSC
Ch-70 VHF DSC

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