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

[Graham Jones]

You are both right.  RF absorption is a combination of amount of material
and its properties.   I think the issue with trains is limited to newer ones
with special windows (I think they are conductive - some cars have them
too).  The combination of shielding from the roof and windows makes it
practically impossible to get a fix.   I was surprised that I managed to get
a fix in a jet aircraft a few months ago - I would have expected this to be
a good shield too.

Graham

On Feb 16, 2010 5:51 PM, "Dave F." <davefox at madasafish.com> wrote:

John Smith wrote: > On 17 February 2010 01:40, John F. Eldredge <
john at jfeldredge.com> wrote: > >>...
Is this correct?

I assumed the reason I had trouble getting reception on board trains
because of what their roofs were screened with.
I can't believe they'd put much mass up there.

Cheers
Dave F.

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