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Thanks Boyd, very helpful.

Hi, I just purchased an Etrex 30 for use in wilderness hiking/running.  I'm trying to figure out if I'm better off subscribing to Garmins Topos and Sat images for download onto the device, or I can get everything I need here. 

Just for reference I do a lot of exploratory runs back in the wilderness, and sometime I get a little off course and need to figure out where I am, and how to get back (I usually do not go out and back, but try to do big loops).  I'm often out for 5 - 9 hours, so I can get pretty far away, and spending the night out does not appeal to me as I go light and fast (camel back, and gu, no survival suplies, and usually just a pair of shorts and running shirt).

All help is greatly appreciated.