[ericthered]

I don't know that Gurps really encourages anything beyond just writing down distances or coordinates. So much depends on the FTL system, and Gurps doesn't tie itself to one.

The old space atlas series (3e) used a grid, stuck the stars on the line intersections (As opposed to in the squares) and added the third dimension of the star's location as a number next to it. It also included a table of all the distances from one star to another.