I consider it a must have, knowing the changes in water depth is key, like yesterday where the fish were holding on a shelf, and I would never have known it was there without the depth finder, and the GPS is sweet, marked my drift and repeated it several times, plus the safety factor for when the fog rolls in, it is sweet.
I run a 12 volt battery on my kayak. It is the one that looks like a brick. I got mine at radio shack for like 25 bucks. Picked up a trickle charger from sears for short money as well. I spent about 8 hrs yesterday with it and barely put a dent in the charge. I run a color GPS/Fishfinder and compass with back lighting...good luck
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