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The solar charger isn't going to do much but maybe a trickle to keep the battery charged when in storage. I gave up on mine. It really didn't charge it like I would expect even after a few days in decent sun.
I would get a cheap depth/fish finder, and a separate battery powered GPS if I were you. Like you said you might kill your battery with the TM, then you will be out of luck in the back country. I have an older Garmin Etrex and love it, it was cheap, works very accurately, easy to use, and I was able to find free maps for it online. Batteries usually last about 12 solid hours of constant use, then I pop in a few more AA's and its ready to go again. I never knew how much I would use a GPS until I got one. Now I have to take it with me even if I'm going to a familiar place just so I can look on google earth to see where I went and had luck.
http://www.microskiff.com/cgi-bin/yabb2/YaBB.pl?num=1299454967
I would get a cheap depth/fish finder, and a separate battery powered GPS if I were you. Like you said you might kill your battery with the TM, then you will be out of luck in the back country. I have an older Garmin Etrex and love it, it was cheap, works very accurately, easy to use, and I was able to find free maps for it online. Batteries usually last about 12 solid hours of constant use, then I pop in a few more AA's and its ready to go again. I never knew how much I would use a GPS until I got one. Now I have to take it with me even if I'm going to a familiar place just so I can look on google earth to see where I went and had luck.
http://www.microskiff.com/cgi-bin/yabb2/YaBB.pl?num=1299454967