Relative position is a point established with reference to another position that is either moving or fixed. The coordinates of this point are usually true or bearing and are a distance away from the point of reference.
Relative position is essential in comparing one thing to another and in measuring the distance covered by an object. For instance, an athlete running from the starting line is said to cover a length that is relative to the point where he began the race. In this example, the starting point of the athlete is the reference point, and the point where he stops is the relative position. The position correlates to Einstein's theory of relativity that says everything in the universe is relative in nature.