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
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.