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

[Erik Johansson]

On 5/22/06, Nick Hill <nick at nickhill.co.uk> wrote:
> There has been a lot of talk about the sirf star III chipset being so
> much more useful. They can after all pick up GPS signals in situations
> where other chipsets will not receive a signal.
>
> This is not always a good thing. If you are in a concrete canyon with a
> sirfstar III chipset, the fact that it can pick up a GPS signal shows
> the signals it is using are bouncing off buildings. It is receiving
> multipath signals. Such multipath signals are bad for accuracy.

Ah, I too have wonder about the accuracy, but I believe that it's not
a big problem. It gets to get a good position even though I'm in
canyons such as these:

Old town in Stockholm, (Gamla Stan)
http://holk.fonky.org/holksidor/057.html
http://members.virtualtourist.com/m/p/m/293d85/

Sure I don't get a good enough lock to know on what street I'm on, but
the streets are ~20meters apart. So it's ok.

/emj