You could trace the wires or you could find the boat's electrical diagram and try to figure it out from that.
Or, you could turn if "off" and see what doesn't work. Turn it "on" and see what does work.
Note: The 24 volt coil is often used in HVAC controls. If your boat has the standard 12 volt DC system, I would start looking in the HVAC system.
Of course if everything seems to work, you don't really have to know what the relay does.
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