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This is a paid asset, but now you can download Radar Arrows Free.
Radar Arrows v2.0
Radar Arrows make it easier for players to find things (enemies, destinations, other players, etc.). If the object is on-screen, you can have an arrow of a constant size hover above that object, making it easier to spot. If the object is off-screen, the arrow will appear on the edge of the screen, pointing to where the object appears off-screen.