Huan:
The most recent generation of receivers, designed specifically for motor vehicle navigation - such as the one in the photo above - are usually accurate to within 3 to 5 meters. The Americans turned off the deliberate degradation of the GPS signals (SA) about 2 years ago.
I can navigate to a specific parking spot over and over again with the StreetPilot III, as long as that spot is not under a tree or something else that would block the view of the sky.
Accuracy and reliability may be less for the general public in certain areas of the world - like Kabul, Bagdahd, etc.
|