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Perhaps this is why I never recall hearing an Australian registered vessel on US General Mobile Radio Service channels while the ship is in US waters. Even the FCC regulations are not this precise. Thank you Australia!

This paragraph is taken from Australian radio regulations: (Word file)

2.5 Operation outside Australia

(1) The licensee of a maritime ship station operating outside the territorial sea of Australia must operate the station in accordance with:

(a) the Radio Regulations; and

(b) if the station is in the territorial sea of another country — the radiocommunications requirements of the country.

(2) If a maritime ship station is to be operated outside Australia on a frequency specified in the Manual for use by the Maritime Mobile and Maritime Mobile-Satellite Services, published by the International Telecommunication Union and as in force from time to time, the licensee must only operate the station to communicate with one of the following stations:

(a) a coast station operated in another country;

(b) a coast earth station operated in another country;