I've installed Explorer 3 on the Android tablet I have. This was a free upgrade of V2 which cost all of $20 on special.
It uses the same 150k maps which are an improvement on the older smaller scale ones. They're well drawn and the contours are useful. But:
1. All the maps together take up over 5 gig. You can install them state by state however.
2. I've lost trust in Hema maps' accuracy and these new ones haven't changed that. Checking them against an area in the Vic high country that I know well: (a) one mountain that was renamed several years ago hasn't been updated; (b) one walking track is labelled a vehicle track; (c) gates aren't marked; (d) some 4WD tracks are named, many aren't.
Hema continue to make a big thing out of auto-routing but in my book if you use that outside of cities and towns you deserve to end up where you didn't want to go!
Like the Explorer app the HX-1 can run the State topos which are in my opinion good maps but there are cheaper ways of using these.
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