On Feb 21, 11:48 am, AMPowers wrote:
I don't believe the US Government has anything to do with regulating you
outside their territories. Instead, each government's version of the
FCC does this. Our government has signed various treaties with other
governments under the International Telecommunications Union which
governs radio broadcast internationally.

My understanding is only subtly different:

1. when you sail foreign, you are liable to both flag state (the
authorities of your vessel's home nation) and the port state (if
you're in the waters of another nation).

2. The reach of some flag states, eg the US, is quite long (as KLC
Lewis suggested) because some flag states have considerable capacity
to project force. And so they do.

3. A port state can act, for instance against a vessel whose radio
equipment is causing interference, without reference to the flag
state. And it can ask to inspect your licenses etc. A port state can
also refer a complaint about your vessel to your flag state authority.

4. Generally the system works as AMP suggests, with port states
accepting that you and your vessel are in compliance with ITU
standards via your compliance with your flag state standards. But
there are exceptions (eg Japan and other port states that limit the
use of radio by their own flagged vessels).

Cheers