I have not noticed any change from the previous OS. I still need to get my heart rate up a little for the exercise ring to move. Did something elevate your heart rate during the drive?
Couple more days of observation: On two recent walks I used the workout app to record them. In 25 minutes it registered 11 minutes of exercise, which is about right because it's a route with some steep hills so my heart rate would be up for approximately half the walk. A one hour bike ride registered close to 45 minutes of exercise because I was riding at a brisk pace most of the time. This all seems consistent with what I expected from Watch OS 1.01.
The Move ring is a more mysterious beast. I understand it considers heart rate, exercise activity, steps counted, stairs climbed, and even distance walked as measured by the iPhone's GPS. Again it seems to behave consistently with what I was getting in Watch OS 1.01. I'm not saying something didn't change. It's not unusual for things to get tweaked. Fitbit has changed their algorithms for "Active Minutes" and "Calories Burned" since I first started using a Fitbit a couple of years ago. Initially my Fitbit significantly underestimated my active minutes and calories burned. At one point I agreed to be in a test group for testing a new algorithm. During my period my usual activity registered dramatically more active minutes and calories burned. When they finally released the update it seemed to me that they eventually settled on something in between.
I still carry my Fitbit One in my pocket for comparison. Both devices report close to the same number of steps, but Fitbit is usually slightly higher. If FitBit says I walked 10,000 steps, Apple Watch will say I walked about 9,500. Stairs climbed is usually a bigger discrepancy. If Fitbit reports that I climbed 50 flights of stairs, the Health App on my iPhone will report closer to 35 or 40. I think stairs climbed is measured entirely by the iPhone though, so I guess the comparison is Apple Watch + iPhone vs Fitbit.
The only calibration I ever did on my watch was when I first got it I followed the instructions to complete a 20 minute walking workout on flat ground.
I would add... if you are getting unexpected results I would try the following: Restart both the watch and the iPhone. Then record some flat walks as 20 or 30 minute workouts. See if the numbers fall in line a little more after that, but keep in mind that using the workout app for extended activity will inrease accuracy. If it's going to take me more than 10 or 15 minutes to walk or bike somewhere, I use the workout app.
Sean
