On Tue, Dec 14, 2010 at 11:08 PM, Rony gnulinuxist@gmail.com wrote:
My mistake. I was referring to mobile phone gps. It is not very accurate. In google maps on my phone, my location is off by about 200 to 300 meters. Not good for giving directions as I am not present on that spot. A left or right turn based on this perceived location can be disastrous.
Check raw GPS data for your phone. It should show number of sats and signal strength of each, It would also show accuracy of current position.
In my phone (Nokia 5230 and N82), location accuracy is about 10 - 15 meters which is good enough for this task. This is in Mumbai. Accuracy is better on highways since more sats are visible.
Dedicated GPS units have better accuracy, E.g. my Garmin unit has accuracy of 5 - 10 meters in Mumbai.
-Shamit