During the First Annual Ghostbusters Grand Prix, Janine Melnitz tried out the Directional Finder, without knowing what it was, while trying to find a way to bring the Ghostbusters back to the physical plane. After throwing it down in frustration, the Finder broadcasted a live conversation among the guys. However, the device soon lost the signal. Egon Spengler used a Direction Finder aboard the Spengler Speedster to search for a crack in the portal that would lead them back home.  The Finder succeeded and found the portal south, southeast.
- ↑ Egon Spengler (2009). The Real Ghostbusters - "Afterlife in the Fast Lane" (1990) (DVD ts. 19:09-19:12). Time Life Entertainment. Egon says: "Gentlemen, I have my Directional Finder working."
- ↑ Tucker, Keith (2009). The Real Ghostbusters Complete Collection Volume Four Disc Five, "Afterlife in the Fast Lane" Storyboard p. 35. CPT Holdings, Inc. Line reads: "Int Spengler Speedster, Egon presses buttons on homing device."
- ↑ Egon Spengler (2009). The Real Ghostbusters - "Afterlife in the Fast Lane" (1990) (DVD ts. 19:13-19:16). Time Life Entertainment. Egon says: "If there's a crack in the portal we came through, this will find it."