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It sounds like you really just need a GPS. A cell phone relies of a decent signal, and does not have a map if you can't get reception. Most GPSs will let you mark a point of interest and it tracks your path.
It will depend on how deep (budget) you want to go with it. A laptop, with a good GPS connected and USGS maps downloaded at home would be great. I am sure there is a forum for it somewhere out there.
THe real mapping software gets spendy real fast. Global Mapper is a great program, but not super user friendly and not real cheap.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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