Re: [St] Speedometer accuracy

["Young, Mike" <myoung@xxxxxxxxxxx>]

The GPS is probably nuts on. Remember that the GPS system is constantly
measuring minute Doppler effect changes in the timing of signals coming
from satellites orbiting the earth. You can't go fast enough on the
surface of the earth to out run a GPS signal. If you held your speed
constant long enough to read both your speedo and the GPS, your GPS had
time to update five or six times. 

Mike 
'06 ST
Seattle
 
 
-----Original Message-----
From: st-bounces@xxxxxxxxxxxxxxxxxxxx
[mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Kevin Liske
Sent: Monday, April 21, 2008 11:33 AM
To: ST@xxxxxxxxxxxxxx
Subject: [St] Speedometer accuracy

I recently borrowed a Garmin Rino 120 from work to take on a road trip.
I
put it on the trip computer settings.
I had speed, max speed, average speed, odometer, and a few other
readings.
It seemed that the Garmin odometer matched the bike odometer very
closely.
I did notice that as my speed increased above 50mph, there was an
increasing
variance in
the readings of the bike speedo and the gps speedo.

Bike     GPS
40        40
50        49
60        58
70        66
80        75
90        83
100      92

I have two theories.  1)  The bike speedo is actually inaccurate at high
speed.
2)  The bike speedo is correct and this gps can not process the signal
accurately
enough to be correct while moving at high speed. (This is a hand unit
designed for
people walking around after all and just may not have the specs to
handle
high speed.)

Any thoughts?
-- 
Kevin Liske
`03 Sprint
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