Mostly the buildings were two stories only. A high-voltage transmission
line runs behind them, the width of the buildings and more away, but
maybe it had some effect.
On 18/11/2012 11:23 AM, Pierre Béland wrote:
Tom
You can try to repeat the experience with this same GPS and compare your
results.
I dont know if this is the case for your. In urban areas, the tall buildings
are obstacles to Satellilte signal. This increases the inaccuracy of GPS
measurement. If you are close to a tall building, you wont receive a good
signal from that direction. Your position is calculated with a principle of
triangulation. You
need to receive the signal fo at least three satellites. And results are
far better with four.
Pierre
...
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