It wasn't the Squelch setting I was refering to in the OP's post. It
was the fact that the VHF Radio "may or may not be on".... When
Navigating, ALL US Flagged Vessels over 20 meters in length, MUST
maintain a 24/7 Radio Watch on Vhf Marine Ch. 13, Period, no excusses,
and if such a Watch was not maintained, and an Incident that provoked
a USCG Inquiry happened, the Vessels Captain would loose his License,
for not maintaining such a Watch, not withstanding any other
circumstance.
I have been involved in USCG Inquiry's where this has happened, and
testified on the technical aspects, and operability, of the VHF Radio
in question. I have also been involved with the enforcment of the
Bridge to Bridge Radiotelephone ACT, from the regulatory side, on
SOLAS Required Vessels of US Flagged and that of other countries.