GPS points relative to grid.
So the GPS system is cool, as is the autopilot system.
What would be cooler however is the ability to anchor GPS points relative to grids instead of just static. This would allow better use of autopilot for all kinds of uses, and also clearly indicate where to dock for players, etc.
To balance this, you could make these GPS points only visible and usable if the relevant grid has a friendly antenna in range. So if the instruction comes up in the autopilot but the GPS point isn't viable it would stop and output the error.