On Jul 17, 2:20*pm, Bruce in alaska wrote:
...
Just about ALL commercial Vessels use 16 for Calling, no matter where
they are in the world. It is what Channel 16 was meant to be used for,
and why ALL commercial vessels are required to maintain a Watch on
Channel 16 while navigating, no matter the size of the vessel. ...

Yes but there are important exceptions. In many places in the US of A
commercial vessels maintain a watch on 13 & VTS and do not watch 16.
See 33 CFR 26 particularly 26.04 (d). This is unfortunate and can be
confusing but if your life depends on getting in touch with a tug here
in SF Bay you better call on 13.

-- Tom.