What are the ways to measure distances on a map and in what units are they measured in?

1- BY RANGE This is measured in Meters or yards. To measure a distance by range is to measure from point A to B in a straight line. 2 - BY ROUTE This is measured in Kilometers or miles. To measure the distance by road/ route, it is very important to follow the curves on the road/ route between the two points (A & B).