The TwoNav app should be something useful for the outdoor and on-the-go person. The TwoNav app for the iPhone costs $69 and includes an unlimited number of free online maps from Spain, Italy, USGS dataset, US Forest Service, and DRCan among others.
The app even allows you to track your performance from altitudes using geoid correction. It also provides more than 60 on-screen tips, 3D views, and the option to use it as a GPS.
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