Re: My GPS Seems to track inside tunnels
- From: miso@xxxxxxxxx
- Date: Fri, 28 Mar 2008 19:47:57 -0700 (PDT)
On Mar 28, 1:31 pm, laura halliday <marsga...@xxxxxxxxxxx> wrote:
On Mar 28, 6:58 am, Gineer <Gin...@xxxxxxxxx> wrote:
I have a Garmin Nuvi which I used this weekend. I was driving through
the tunnel from New brighton into liverpool and was expecting my GPS
to report that it had lost GPS reception. Interestingly, it seemed to
track my position all the way through the tunnel. Is this because I
have WAAS turned on (and if so, do they build something into the
tunnels for this (Where can I get more info about this?)) or was my
GPS getting it's signal up the tunnel? I guess the tunnel is about a
mile or more long.
David
Some GPS units have accelerometers, so even if they lose the
GPS signals, they can continue to track on inertial navigation.
Laura Halliday VE7LDH "Non sequitur. Your ACKS are
Grid: CN89mg uncoordinated."
ICBM: 49 16.05 N 122 56.92 W - Nomad the Network Engineer
Most of the built-in nav systems have accelerometers.
.
- References:
- My GPS Seems to track inside tunnels
- From: Gineer
- Re: My GPS Seems to track inside tunnels
- From: laura halliday
- My GPS Seems to track inside tunnels
- Prev by Date: Re: My GPS Seems to track inside tunnels
- Next by Date: CORS COORDINATES REVISED AT SOME SITES
- Previous by thread: Re: My GPS Seems to track inside tunnels
- Next by thread: Re: My GPS Seems to track inside tunnels
- Index(es):
Relevant Pages
|
|
