IIRC the movie uses sonar as an analogy, not the literal mechanism.
... the ... analagous literal mechanism would now be how WiFi itself can be used to map environments and movement within them, kinda like sonar.
IIRC the movie uses sonar as an analogy, not the literal mechanism.
... the ... analagous literal mechanism would now be how WiFi itself can be used to map environments and movement within them, kinda like sonar.