I've got an app called NZ topo maps on my samsung and it downloads maps over wifi at home if you scroll round the area you're going to. The are exact 1:50k topo maps with 20m contours and look great. The pick up seems just as good as my garmin - loses it occasionally under cover. But its not waterproof and rugged and I haven't figured how to display your route as you go. . The touch screen on my GPS sucks. You can do quite a bit storing and editing routes on your computer at home using garmin basecamp. But I think garmin could be struggling to sell single function GPS units in future.
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