Great tool
Calibration using land marks and sun make this a very accurate tool. One thing is you can no longer zoom close in on satellite map. Previously I was able to zoom in very close to measure and place destinations. Now its a strain to do this. Will add a star when full sat map zoo is back. iPhone 4 ios6.
Updated to 5 star. Everything is working perfectly and seems to be more accurate. iPhone 6
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Spyglass, v3.7.11