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From Terraria Wiki
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The Radar is an informational accessory that detects nearby enemies when equipped or left in a player's inventory. It is one of the three parts necessary to make the R.E.K. 3000, with the others being the Lifeform Analyzer, and the Tally Counter, and as such is a required ingredient in making the Cell Phone. If a player is within approximately 20 blocks of another player on the same team who has a Radar, that player can also see the enemies detected by their Radar.
It can be obtained from looting wooden chests found on or near the surface or from Wooden Crates.
- Radars are used at plane control centers to track planes and their routes.
- Radar stands for RAdio Detection And Ranging.