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Used much like a tracker the Controller(radar) can be used for a variety of ways.
FunctionsThe Controller for the most part functions much like a radar would, and often is referred to as a radar rather than the controller (Its labeled as Controller in Gantz Manuel) . The Controllers used much like a tracking device, showing the locations of the targets. Many a time the locations of the targets do not fit onto the small screen at one time, and other targets could be located other locations but the user must move to or near that location for it to be seen.
Even as a tracking device it has alot of bugs, and often gives the hunters the wrong location or sometimes not being able to pinpoint the location of all the targets at all. The Controllers also have the ability to if a user tunes it correctly can allow for invisibility. While the controller is in tune the user becomes invisible while in the mission or outside, but on separate occasions aliens have been able to see the hunters even if they are invisible (Tanaka mission, Temple, and Osaka missions.). The Vampires that have shown themselves in the real world and in Gantz have been able to see past the invisibility with special glasses.