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How the PTC (police Tracking Computer) Works. The PTC consists of a r~dio receiver, directional antennae computer and display head which are installed in a police car and used to identify and track a LOJACK equipped stolen vehicle. While on routine patrol, police officers have- their PrC's turned on. Whena. patrol car comes within range of an activated LO.JACK transmitter, the- officer will h~ ~ audible tone from the tracking computer. The officer wiD- also receive a 5 character alphanumeric display on the PTC that identities. the' LOJACK transmitter which. is broadcastiD.g the homing signal. The 'officer'" then radios .the dispatcher and requests an identification of the LOJACK- signal. In the event the officer picks up mort than one signal, he can "lock" onto whichever. signal he-wants and call for backup to pursue the other -stolen vehicles. The dispatcher enters the _code .into the .law enforcement computer~- and is then able to tell the officer: 1) a compl~te description of the vehicle, 2)anypertinent information about the theft. The frequency of the homing . signal is automatic8ny increased to once per second. . 'U:sing the rela~ve-,bearing indicatoJ; on the -trackirig computer,- the :officet:-iS-' able to steer his car in the direction -of the-stolen vehicle. Using the signal.. '::Strengthindicator, distance to the. target can be determined. In 'some instances, the officer may not want to approach the vehicle right away, but rather establish surveillance. - Once the stolen vehicle is recovered, the officer notified his dispatcher,. who in turn makes a computer entry returning the LOJACKtransmitter --to the "listen" mode. By combining the LOJACK retrieve (LJU). with the LOJACK Prevent, Alert or Alert Plus, consumers can get a'TOTAL PROTECTION package against the amateur/joyriding thief. LOJACK POLlCE PRODUCTS BROCHURE REVISED _ June 9, 1999 PAGE #8