Not great. In theory, the app sounds great, but it's not intuitive. The layout isn't bad but that's about all I can say. It doesn't capture the formula at all, and you have to keep switching screens to get to the one you want. When I first used it in the field, the scales were all out, and where it showed a distance of 100ft, it actually meant 350 metres (verified by putting the coordinates into c:geo). I certainly wouldn't pay for the full version of this app and I've uninstalled this one too.
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