>>The coast guard, port pilots and dock workers don't need the captains permission to operate their ht's when aboard other vessels. This also applies to tourists with cellphones on cruise ships . <<
This statement is a combinaton of misunderstanding and mistake. The Coast Guard, pilots and dock workers HAVE permission; it's granted with their authority and function. And cellphones, technically (but unenforceably) are illegal there. FRS, CB, and Amateur Radio, too.
ANY operation of a radio transmitter aboard a ship, plugged into ship's power or not, is the responsibility otherwise of the ship's Master and, in the case of foreign-flagged ships, must also comply with the licensing requirements of the nation under whose flag the ship is registered. Having a US license is in this case only the first of many things which must be done to operate legally aboard ship.
The ARRL has some information on operations at sea. This is mainly aimed, it seems, at US hams who are boaters theselves. See "Amateur Operation on the High Seas" athttp://www.arrl.org/FandES/field/regulations/io/maritime.html
For those of us driving onto or through a US military reservation, operation on them is usually forbidden without prior permission -- even CB's and FRS one can buy in the Base Exchange.
BTW, many countries get angry at US tourists for our habit of bringing FRS radios with us where they're illegal. Could make one's vacation more memorable and expensive than planned.