There's many, many frames of reference you can use to map your GPS data into actual on-ground coordinates. There's a number of systems that do this, but usually

There's many, many frames of reference you can use to map your GPS data into actual on-ground coordinates. There's a number of systems that do this, but usually it's done with a projection from abstract GPS points into real-world positions via something like this: https://en.wikipedia.org/wiki/World_Geodetic_System https://en.wikipedia.org/wiki/World_Geodetic_System