I would like to explian more since “GPS by GSM Cellphone Detection”
Recieving (Detecting, locating) individual GSM cellphones handshakes
BTS by at least (two antennas) to get cellphones positions (x,y) and
to a map to display the cellphones positions.
Its like www.pathintelligence.com but with more flexibility.
For public transportation it would require wider area.
For law enforcement it would be mobile.