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Two Steps from Hell - Victory
Two Steps from hell - Armada
Those provide some nice background pieces without being too obtrusive. but if you want to go for Pure Pirate, Almost Anything by Alestorm.
ALESTORM - Shipwrecked is a favorite of mine.
Amon Amarth, The Pursuit of Vikings is another good one. Both Alestorm and Amon Amarth are probably a bit heavy for game music but they are Ship Game, if nothing else.