"Steve" wrote in
:

So should I assume that the guard channel is "USCG calling" and the
working would be "Calling; distress & safety working"??


Channel 816 is the USCG calling channel in the 8 Mhz band....

Channel 821 is the calling channel for other shore stations, those that are
left.

Coasties monitor Channel 601....Shore stations 606, but they also use the
ship transmit frequency simplex....

The reason CG swaps monitoring the 4 Mhz band at night for the 16 Mhz band
in the daytime is propagation. 4 Mhz is virtually dead all day because it
penetrates the sunny side ionosphere. 16 Mhz is dead at night because its
reflective layer in the ionosphere is only on the day side of the planet.

No sense listening to a band that's dead.....

Your CG calling freq list is on:
http://www.navcen.uscg.gov/marcomms/cgcomms/call.htm

The coastie working channels are in a list at the bottom:

HF Radiotelphone (single sideband) - Working Channels

These channels are available at all Coast Guard Long Range Communication
Facilities for traffic handling purposes after initial contact is
established on the HF Radiotelephone (Single Sideband) - Distress and
Initial Contact frequencies.

ITU CHANNEL
KHz SHIP STATION
KHz COAST STATION

424
4134
4426

601
6200
6501

816
8240
8764

1205
12242
13089

1625
16432
17314