16.7.1 A vessel, while at sea, should maintain
a continuous watch:
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.1 where practicable, on VHF Channel 16;
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.2 where practicable, on VHF Channel 13;
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.3 on VHF Digital Selective Calling (DSC), on
Channel 70;
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.4 if fitted with a MF/HF radiotelephone, on distress
and safety DSC frequency 2187.5kHz;
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.5 for satellite shore-to-ship distress alerts,
if fitted, with a radio facility for reception of marine safety information
by the INMARSAT enhanced group calling system; and
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.6 for broadcasts of marine safety information
on the appropriate frequency or frequencies, on which such information
is broadcast for the area in which the vessel is navigating; normally
using the international NAVTEX service or INMARSAT’s enhanced
group calling facility. (Further information may be obtained from
the Admiralty List of Radio Signals volume 5.)