As for the AA solution, it's been beaten to death on KFS.com. It all depends on your ff. As Madscientist noted that color machines will draw much more juice, a combo gps ff unit will probably draw more than 2.5 mah will get you for a full day on the water.
As great an idea it is, and depending on your unit, changing out 10 AA batteries after 3-4 hours is not as efficient as the weight of hauling a 12 v 7AH battery that will last for 10. Tried it and loved it with my X-47 (10+hrs), but it wouldn't cut it for less than half a day with my DS400.
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