Indicator

An indicator is a small compass that leads a person towards a tremor. Marvin White was given an indicator by Director Wimple of the United States Seismological Bureau so that he would be lead to the source of a tremor that they were almost certain would be running east on Second Avenue, unless it was a false alarm, as many of the previous readings had been.

Appearance
Super Friends (TV Series)
 * Season 1: The Ultra Beam (1973)