A teen Spider-Man invented his first Spider-Tracer to find Doctor Octopus. In those early times he invented a receiver device as well. Spider-Man eventually found out that by changing the frequency emitted by the Tracers, he could trace them with his Spider-sense.
Spider-Man has occasionally pulled the tracker out of storage in cases where he lost his spider-sense or needed greater tracking range than his spider-sense alone could give him.
A modified version of the Spider-Tracer-Tracker was made by Peter to track the location of Alpha after he went missing.