OK Rabid, i see your point that a ipad tethered to a cell phone would likely get the GPS data wirelessly from the cell phone ( without cell service). draw back is it is another device ( cell phone) to keep powered on trips into the back country ( i.e. a week or more in the mountains away from access to any AC electrical sources). Might have to go that route. looks like the Navidia Shield K1 tablet not available anywhere as it's discontinued unless buying used. Have not considered any other android tablets yet. The tablet question is taking more effort than any other.