The GPS is not accurate

Question

Every time I open the map I found that the position located is very not accurate. The problem exists no matter what positioning method I used (bluetooth GPS, AGPS, integrated GPS), and they all have the same WRONG position. When I connect my N82 to a bluetooth GPS, the position is not accurate, there is an about 10 meters mistake between the position it located and the actually position. But when I connect the same bluetooth GPS to my another PDA and use the same map application, it works fine and very accurate. The inaccurate position problem just happened to my N82. Does anyone get the same problem?

Answer 1

Most commercially-available sat-nav systems are described in manufacturer small print as having positioning "accurate to within 20-50 metres" (different companies make different claims about the exact distance), so the statements above are correct but they aren't actually faults.
Remember also that a the a GPS system isn't connected to the same satellites all of the time, even a 12-channel system picking up between six and eight satellites on average will drop out of view of some satellites and into the range of others, so it is constantly recalculating its position from different data. If you are getting signals from less satellites, the 'jumps' become more noticable because the position is being calculated from less data.