We have used Hema on a GPS iPad. It has been invaluable. Aldo worth a look is their newish product, Hema Explorer which has integrated maps and claims much higher resolution than the one we ha be used.
Positives we have found are that the maps are good quality, we always know where we are with the GPS location, we can find likely camp spots in the middle of nowhere and we have maps for the whole country with us always, no matter the Internet coverage. We can also track our trip when we want to.
We also have it on our iPhones and can use the tracking function when we go for walks, especially if poor tracks and we need to retrace our steps.
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