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Me and a few friends are doing a 7 day trip with no access to AC current( No power), no plug-ins.This is a cross country type mtn. bike trip, what GPS system would be the best for our trip? A lightweight handheld or handle bar mount gps system is what we have in mind, but which one will use the least amount of batteries?.Also is there a system that can be recharged by say... solar or handcrank or bicycle generator? We don't want to carry 20lbs of batteries.Any suggestions would be helpful.
 

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check out Garmin's Etrex Vista HCx. It's rated for 25 hours on a set (2) AA's. It has the longest battery life in a gps that I'm aware of.

REI and places like that have solar chargers, etc. but probably weigh more and certainly cost a lot more than probable 3-4 extra sets of AA's you'd need to carry.
 
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