I cannot help you but a chance to share my experience with. Hema maps on iPad. We have found that while a steep initial investment in getting the maps, we have no regrets. Included are all Hema maps across the country including the desert series we used on the most recent trip. Includes regular updates to the entire map series.you can instantly access any of the maps. They are big - 1.5 gb, and updates use a lot of data... But again the most up to date maps are on your device!
we love being able to know where we are whenever we travel - also can track a route, check speed, know GPS position etc. we mark POI and camp sites as we go. Have not used mud maps etc, but extremely pleased with our cjphoice...
Sorry I cannot help you, but may be of interest to others.
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