Originally Posted by
FBinNY
This is like the old story of the guy with two watches who could never be sure of the time.
Bike computers, both wheel based and GPS based, have a certain programmed lag before the stop the clock when you stop. just about all, give you a minute or so to allow for stops signs, red lights or just quick breathers, while considering you to be in continuous motion.
This can affect the breakdown of riding time and stopped time, and indirectly introduce "errors" in average speed. There's no standard in what defines a pause vs. a stop, so a difference of opinion between Sigma and your GPS unit can account for what you're seeing.
Thanks for the answer. I had hoped that the Sigma, which is a non-GPS unit that simply counts wheel revolutions to calculate speed., would simply stop the "moving timer" when the bike stops. I don't really see the point in it continuing the timer when you are stationary, unless it has a mode for "ride time" and "total time" - which I don't think it does. I can find the total time from the clock, so all I'm interested in is my total moving time.
I guess I'll to do some tests with it's internal stopwatch to see how this aligns with the ride time, to determine how it processes short pauses.
Thanks,
John