Locator Triangulation

The mod is a client-side Fabric utility that works out coordinates with triangulation, using only the data a regular vanilla player can see. It does not read hidden server data. Locator Triangulation runs on the client alone, so the server needs nothing and players join without installing it. The mod is open source under the MIT License and has files for Fabric only, covering 1.21.8 – 26.3 across eight release versions, with 1.5.0+mc26.3-fabric for 26.3 as the latest file.

Triangulation is done by hand with a calculator, and the mod only helps the player record the readings. The player runs the locator at one position, notes the direction, moves away at an angle and runs it again. Regular triangulation commands work with the same prefix. The mod remembers the locator state and the current view yaw, so a second reading can be matched to the first.

The result is only as good as the geometry. Accuracy depends on the angle between the two view directions, and good results come from angles between 20° and 150°, with near-perfect accuracy around 70° to 100°. Positions that form a roughly right angle relative to the target give the strongest result. A corner color shows the quality: green means near-perfect, yellow means acceptable with a small error, and red means poor. The author notes the map is for example purposes only.