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To define a region to download map data for, simply click and drag. The right button allows you to pan around the map. A search box allows you to instantly jump to a particular area. In the screenshot, a search for New York centered the map there.
Download times can vary, at the highest zoom levels, it may take a while. The good thing is that NaviMapper does not clutter your device with thousands of map files - it creates a single database file - very neat indeed.
The mobile client was fast to pick up my location using GPS. Panning around the map was a smooth experience, showing the advantage of offline maps compared to online ones.
A separate feature allows you to track your movement. Information such as distance travelled and speed can be recorded and saved.
More information and download:
NaviMapper on xda-developers.com
Free to use, donations encouraged.