I really dont see a reason to keep this, its too easy to find anyone by just using the GPS, law enforcement and criminals included.
Main issue comes when police officers are after a criminal, when they loose the person they were after or see a criminal, /GPS player (ID) and they can track them easily.
There are ways to still allow this for civilians however, for example you could pay for a call on the payphone to Track a person or get the position of the person for a limited ammount of time.
Same goes for People that have a Bounty on them, just ring the payphone to know the position.