If your total draw is under ¼ amp and you're running LEDs, the 22 ga can technically handle it, especially over short runs. But for the sake of durability and future-proofing (especially in a marine environment), I'd personally go with 18 or even 16 ga. Gives you a little more peace of mind and wiggle room if you ever add anything down the road.
Also, thicker wire is a bit more forgiving if it ever chafes or gets exposed. Cheap insurance, really.
