A step further
They sell an electric blanket that plugs into your 12V socket. Wife uses for early spring and the fall. You might to be able to use one of the double sockets. Don't know how much current they draw. Got mine at Amazon. Some are big enough for 2 persons, some with auto shutoff.
Speaking from experience, don't forget to unplug when boat is shut off. Had dead battery at Wolfeboro docks in the fall. Luckily gas station had one of those battery packs.
Dave M
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