Not for offline use
This is a great map app for use with Open Street Map data as long as there is an always on data connection. However, there are some problems with its offline caching abilities.
Firstly, the in-app-purchase download tool ($2), has a bug. After I downloaded an admittedly large amount of map data (thousands of tiles), some tiles were returned with an "access blocked" notification instead of map data. I realize that OSM is volunteer run, and we cannot expect to download unlimited amounts of data from them, however, there way of knowing what the download limit is. Now, whenever I try to download even a couple of hundred tiles, some are returned as "access blocked" notifications. These blocked tiles cannot be refreshed, and exist as a hole in the cached map until the entire map cache is cleared. Instead of poisoning the the map cache with these tiles, would it be possible to throttle large downloads or pop-up a notification that the selected download is too large? This paid-for download tool is now useless to me. I dont recommend purchasing it.
Secondly, if you are able to manage to cache a map for offline use (this can be done by panning around the map), it can suddenly and unexpectedly lost. Even when the "offline mode" setting is turned on, I have found that I have lost maps that were previously cached when I have been in areas with no service.
But like I said, if not for the problems with the download tool and the offline cache, this is an excellent, five star, app. The user interface is simple, elegant, and very user friendly. The feel of the zooming and panning of the map, with inertia, is great. If you want to cache Open Street Map data, check out the Pocket Earth app (Im not affiliated with them in any way, I just love the app).
dlpell about
OpenMaps, v4.6.4