Apparently nothing. Certainly no being boarded by pirates, which was and still is a very real threat in that region.
During WW2 Hemingway used his private boat as a volunteer submarine patrol craft and the crew was given military arms by the US Navy.
An uncle cruised those same waters in the 1950's and he also kept a Thompson on board. A nice one in full FBI case with accessories. First gun I ever fired in fact, at the age of six. Dad held it steady and let me pull the trigger. it was at dusk so all I remember is the muzzle flash from the Cutts compensator. They were using the Tommy gun to blast locust posts level with the ground to remove the fence between properties my uncle had just bought. The fence posts were reduced to splinters by short bursts.
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