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Old 06-19-2007
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Just remember that the amp-hour level of a battery bank is also dependent on the size of the draw. If the draw is fairly low, the effective amp-hour rating of the battery bank will be higher than if the load on the bank is high. The higher the load, the lower the effective amp-hour rating of a battery bank will be.

The GPS is a fairly light load, and will give you a fairly long run time. A 120 Watt 12 VDC searchlight will kill the battery far more quickly, probably bringing you down to the 50% level in 8 hours, rather than the 9.5 hours you would expect.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
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