title: Can two cellphones act like radar/sonar with each other?
body: <p>I was wondering if it were possible to have two cellphones interact with one another like a radar/sonar device to be able to find one another or be accurate within maybe 500 yards or so? Also, if there is a way to do it without the GPS or connecting to a cell tower (like being indoors or out in a desert)? Are there any technologies resident in a cellphone that can bounce off each other link radar to find one another basically without the need for gps/cell tower triangulation? Im trying to create a fun app similar to the Ghostbuster's EKG Meter :-)</p>