There is a fee for the license. A Restricted Radio Telephone Operator Permit may be required if you intend to visit foreign ports or communicate with foreign coast stations. The Operator Permit is not required in the United States. Contact the FCC for more details. In cold waters an immersion suit should be carried for everyone on board.
Cellular phones are an option in many coastal areas.
Within the next few years, geostationary satellites will make detection almost immediate. Registration improves response and reduces false alarms.