actually ASN looks a bit smarter than that.
Here's another crazy idea. Use a video camera close to the road (I have
a bullet cam that can be mounted on a car) then pattern match the images
to track motion (like an optical mouse does) then combine that with a
trace from a digital compass. Then by taking gps readings at either end
of the tunnel you can calibrate those traces to counter cumulative
error. You should then be able to get a really accurate trace.
Thom Shannon wrote:
Isn't ASN just a compass?
Nick Folwell wrote:
I have no idea if this would work, but...
Some TomToms have something called ASN - "Assisted Satellite Navigation". It
basically keeps you navigating even if it loses the signal, eg in a tunnel.
I think it uses tilt switches or similar to work out which way you're going.
And you can get the Event_Logger software for TomTom, here:
http://web.tiscali.it/macri/Event_Logger/
Now if you went through the tunnel with ASN turned on, and Event_Logger
logging - would it log where TomTom "thinks" you are?
Nick
Nick Folwell
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