Simple Mob Radar Mod 1.12.2 adds handheld mob radar that detects a number of nearby hostiles and the direction of the nearest one.
Shift-scroll to change selected mob, right-click scan for target mob, that?s all there is to it. All mobs within range will be highlighted and the distance to the nearest one will be displayed.
Same goes for the passive finder except it has a bigger default range. (150)
Simple Mob Radar Mod 1.12.2 (Pocket Monsters)