Mr Cholmondeley-Warner wrote:GPS is usually fairly accurate. It depends on how good a signal it's got, but for most purposes once locked on, should be better than most speedo's.
Mr Cholmondeley-Warner wrote:GPS is usually fairly accurate. It depends on how good a signal it's got, but for most purposes once locked on, should be better than most speedo's.
Gareth wrote:GPS speed will generally lag behind real speed. I think (and I hope I'm correct in this) that GPS speed is derived from successive GPS locations, each of which will have different degrees of inaccuracy. As a result of this, the software in GPS receivers will average the results of a series of speed calculations. Assuming my model of how this is implemented is correct, GPS speed will tend to be more accurate when driving in a straight line than when cornering. Finally in a moving car some of the successive positions will be missing due to changing reception conditions.
Jimmy wrote:I did a quick search and couldn't find the answer, so here is my question:
At a steady 60mph indicated speed on the speedo in my car, my satnav tells me I am doing 55mph.
Which should I have more trust in? Are satnavs more accurate than normal car speedometers?
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