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The real drain is when the autopilot needs to do work. If the boat is not balanced, the autpilot set to maximum sensitivity and the seas uneven you will drain more power. the 500mAh is just the minimum drain when turned on, but that is only 12Ah for a 24 hour period and a typical boat battery will have 100Ah. Does your boat have any means of charging batteries (perhaps an alternator on the outboard/inboard)? When the Simrad has to control the boat the drain will go up to several amps while the motor is turning.
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