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Thanks to Mojang for the original idea, and thanks to SIT for porting to Fabric.
Track other players' locations on your experience bar like a compass!Now on Forge!
Each player's color is determined randomly by their UUID. You cannot change your UUID (unless you're playing in offline mode); therefore, it's impossible to change your marker color.
When a player is very far away, their marker starts to fade
There are three ways to hide from the player locator:

Track the location of other players on the experience bar like a compass! Now also on Forge!