Middle Range Spot tracker has Functions runs on 3x AAA Batteries run time 3 days. This unit is good for a hike if you do require tracking and waypoint marking

Pros	Cons
Gives Emergency GPS location and calls for help	High Equipment Cost
Can call for non emergency help	Requires yearly registration
Can send ok message	Messages cost if sent to a phone (except Emergency)
Work every were you can see a good amount of open sky
Easy to use
Can real time track
Can save way points

See Spot page for more about Spots

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