To determine the scale both measurements must be in the same unit, either feet or meters. 1 meter = 3.28084 feet525 meters = 1722.441 feet Scale is 4.2 / 1722.441, or 0.00243839992 1 foot = 0.3048 meters4.2 feet = 1.28016 meters 1.2801 / 525 = 0.0024389992