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Hi Linton,
Your call sign is something you obtain when you get your Ships Radio License, and will look something like "ABC 1234." Here is a link that will give you all the information you need to obtain the license: www.wireless.fcc.gov/services/index.htm?job=licensing&id=ship_stations. You need to have the radio license before you get your MMSI and the radio license will contain your call sign.
When using your radio, you can use your boat name as your "handle," but your call sign comes with the Ships Station Radio License.
Best,
Captain Craig Bliss
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