[OSM-talk] Choice of GPS for bicycle use in London

[Nick Whitelegg]

>> If I remember correctly, GPS satelites are not geo-stationary, so the 
exact
>> number of visible satelites are likely to vary a little over time. I 
guess
>> this may have a strong effect on accuracy in highly built up areas and 
would
>> explain differing results at different times.

>Yes, and you can forecast how many satellites are going to be visible,
>for example on this page :
>http://mappinghacks.com/projects/gpscal/query.shtml

It would be interesting if this site allowed past dates, so one could get 
an idea of whether particularly successful, mapping-wise, expeditions 
correlated to a large number of satellites visible.

Nick



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