This will set the first marker. To mark point A right-click on the starting point and choose the Measure distance option. As of yesterday you can now right click anywhere on Google Maps on the web and choose measure distance to bring up a digital ruler thatll tell you just how far away its final point is.
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Right-click on your chosen starting spot. On your Android phone or tablet open the Google Maps app. The tool is useful for estimating the mileage of a flight drive or walk. Right-click on your chosen starting spot.