gps tracker and gsm tracker no longer works nowadays against car-nappers and hi-jackers, a friend of mind in the PNP told me that the arseholes are now using a jamming device which could easily be bought for the low price of 700PhP compared to the thousand of peso worth of your security and tracking device
however there is hope, ala mercedes s class security system(i think the honda accord also has this tech) wherein if ever the radio signals from the key and your car got jammed the car would automatically stop