It means all dimentions are 1/50th of the actual object. So for example a one foot long scale model of a boat would be of a fifty foot long boat.
Whatever length unit you use every 50 units in the reality is only 1 unit on the map. 50 meters in the reality makes 1 meter on the map.Same for: miles, kilometers, yards, feet, centimeters...... etc. Whatever the length is in reality divide it by 50 and you get the length on the map..... and any length you have on the map (simply measure it) multiply it by 50 to get the distance in real (same units !).
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