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Old 05-30-2013, 02:06 AM   #53 (permalink)
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Originally Posted by jeff88 View Post
Like I said, I do like the idea and it did get me to wondering if I could use an Arduino based GPS shield to get the same effect and it would still be able to send the result to a display of my choosing. I don't know if this is possible, maybe Occasionally6 can chime in on that.
Using just topographical data may be possible DIY but I don't know how to do it.

This may be useful:

Originally Posted by niky View Post
The Racelogic V-Box gives you altitude readings in diagnostic mode, accurate to a tenth of a meter or so, given a good signal and an external antenna.

But it's a squiggly little number on a diagnostic screen full of satellite tracks, GPS time, latitude and longitude coordinates and etcetera.
That Racelogic does it means it is possible to use a GPS signal to determine velocity and elevation in real time. The supporting documentation for the Racelogic loggers says it uses the Doppler shift in the GPS signal data. I think that's beyond DIY.

That the price tag on the Racelogic stuff is $1K+, however good the quality, might be some indication of how difficult it is to do in that way.

Last edited by Occasionally6; 05-30-2013 at 04:59 AM..
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