Ski Speedometer

"fat_boy" wrote in message
ups.com...
I saw this on half baked, and it spiraled into a discussion on the
granularity of the surface of the piste.

What will really work though?


OK, my hands are in the air!!! I did get the idea from the halfbakery.... I
thought it could work though. For many years I have wanted to find my skiing
speed and allways thought about a device with a wheel attachment until
portable GPS became available and cheaper. I did use a Garmin Legend for a
few years but for this year I will be using my Windows smartphone (SPV C500)
with a bluetooth GPS unit and the software called Skido
http://www.skido.info/ . The only problem with this is that they have not
done any calculations to incorporate the vertical as you say. The problem
with the GPS altitude is that there is a degree of error. They are aware of
this problem and I have suggested they could sample the data and give two
speeds which are the non-altitude related speed and then an estimated speed
based on the actual based on distance along with altitude. With some clever
calculation im sure you could get within 5-10% of the actual speed, this is
no good for any serious record attempt measurements but it is good enough
for the recreational skiier.

What about one of these?
http://www.rei.com/online/store/Prod...ry_rn=40001903
It uses radar, no data given on accuracy though

Paul