Subnautica Map or Relative Distance Mapping Tool
The underwater exploration game Subnautica has GPS beacons to help find points of interest, but it is very easy to become turned around in the underwater canyons and not know which way to go. I've had an idea for a while of using either elastic band spring physics or trigonometry to use the relative distance to various beacons to establish their relative positions on a map.
Beacons are very useful but can get cluttered and are not as nice as a map.
By going to several distant points and recording the relative distances to the various beacons, I can triangulate their relative locations.
I use spring physics to stabilize the relative positions.
And now I have a basic map and can start exploring for my final resources.