You need to be really careful with the two-way radios if you bring them. Just because they are legal in the United States, does not mean that they are legal in all the ports/countries you may be visiting. As a ham radio operator, if I want to use any of my transmitting equipment on board, I have to get advance approval from the master of the vessel, and make sure I don't interfere with normal ship communications. If I want to use it in the ports/countries, I have to get a license from that country (or they have a reciprocal agreement with the U.S).