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Echolocator instantly reveals the locations of all opponents on the stage for approximately twelve seconds. And it doesn’t just work for you. Your teammates can see the locations of the enemy too. Opponents are shown on the screen as circling squid icons. The lines extending from your character’s feet show the direction in which each opponent is located—so even if an enemy is behind you, you get an indicator. With a quick glimpse, you can see exactly where each enemy is positioned. Use Echolocator in conjunction with a teammate’s Killer Wail or Inkstrike. By knowing the locations of each enemy, aiming the Killer Wail and Inkstrike specials is much easier, resulting in more splatted opponents.
— Splatoon Prima Guide