This is my "go to App" for topo maps and I use it quite a bit. I find it works well and I can honestly say I've never had any issues with it.
Not having used (or needed to use) any other App I can't compare it to other offerings out there, however there are two functions I really like:
1. The GPS tracking functionality onto the map in use. It's always bang-on and has been helpful a couple of times in flat fog-bound terrain.
2. The ability to "zoom in" on the map. This is to say you can enlarge the part of the map you're interested in to check detail.
I have my local area permanently downloaded but if I'm going somewhere new I check out the larger area before I head out and cache the map to the phone memory. I don't use the route-planning function but I guess it could be handy.
Overall its easy to use and does everything I need it to do. I have been a PRO user for 6 years now and its the most I've ever paid for any APP. Is it worth $20? That's up to you, but when hard copies are almost as expensive per sheet I guess you can justify it.
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