Hey Tom,

I agree with pretty much everything you've said here.  I've got a
question though.  Doesn't differential GPS buy you better accuracy.  And
doesn't it relieve some of the line of sight problems or do you still have
to have a satellite lock as well as the local signal?

Yeah sure it is still a lot of infrastructure but wouldn't multiple antenna
in a down town area boost signal and accuracy?  How much more
infrastructure is that, one transmitter for say a four block area verses
how many talking signs for that same area?

Just curious.


--
Blue skies.
Dan Rossi
Carnegie Mellon University.
E-Mail: [log in to unmask]
Tel:    (412) 268-9081


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