[OSM-talk] fwd: Two thirds of mobile users want driving ANDwalking navigation

John Smith deltafoxtrot256 at gmail.com
Tue Feb 16 16:16:45 GMT 2010

On 17 February 2010 01:40, John F. Eldredge <john at jfeldredge.com> wrote:
> Frequently you can't get a position fix at all, if the building has much metal in its structure.  I can't get a position fix from inside my house unless I am near a south-facing window, probably due to a metallic-foil vapor barrier in the attic.

It has little to do with the material it's made of, it's all about how
much mass an object has, the more mass the more it will absorb RF.
Trees can absorb enough signal to prevent a lock or greatly reduce the
accuracy etc.

Newer navigation satellites increase the amount of RF being sent, but
that won't help if you have several floors of concrete above you.

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