There are many kinds of GPS hand held units. There are gps laptops, gps mobile phones, gps receivers for automotive navigation and gps systems for hiking, gps golf systems and other outdoor sports to name a few.
The GPS in mobile phone is interesting because the FCC mandated that all emergency calls from mobile phone had to have location information automatically passed in on the call. This is for the obvious purpose of aiding rescue services in finding and arriving to whatever emergency that might exist.
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