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From YPPedia
A pirate's hearties are those he or she likes enough to add to his or her hearty list. This list, which can be found in the crew panel on the sunshine widget, allows the pirate to know if his or her hearties are on at a glance. Hearties are also underlined in game scenes to make them easier to find. Hearties are also exempt from the usual do not disturb restrictions. Up to 250 hearties may be on the list at any one time.
On subscriber oceans, non-subscribers can not invite others to be their hearties, but may accept a hearty request.
Players add hearties by clicking on another character and selecting "Invite to be your hearty," at which point a confirmation screen is sent to the player in question.