I use the Hema iPad app and Memory Map Topo (1:25k and worse - not cheap, but good, however (mildly) annoyingly the planning software for the computer is PC only) on an iPad 1 wifi for my offroad navigation - quite happy with it, works well. Normally use Google Maps on an iPhone for onroad navigation (and occasionally I even use the car Navigation system ... ).
For GPS signal, I use a GNS external bluetooth GPS/GLONASS receiver (aviation quality, very sensitive and accurate with a long battery life) - you can get a GNS 2000 for about $165 on ebay.


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