Radar uses radio signals, which are emitted, bounce off things are their reflections are picked up and translated into some kind of image. Sonar is esentially the same, but uses sound. Echolocation is sonar, as bats use sound. Munch's SkullJack and the Vykkers also use sonar.
Although how they manage to track particular objects like snagged Fuzzles and critter cages is beyond my scientific understanding. But like you say, it doesn't matter for the purposes of the game.
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