So, I have used both a speedometer and a heart rate monitor in the past, but stopped using both after a time. I still have them in the closet but the batteries need replacing. I haven't used them for a number of years. Fast forward and I find my kids have gifted me a new Apple Watch and one of it's many functions is a heart rate monitor and speedometer.

Of course it records all the information it accumulates and I was surprised at the results. I expected my heart rate and speed to be lower now that I'm older, riding a tank of a bike and not terribly interested in pushing myself as I was 20 years ago but it seems to me both my heart rate and speed are far lower than I thought they'd be.

Not that it matters much but I'm thinking the Apple Watch just isn't nearly as accurate as the old speedometer and Heart rate units I used to use (Timex Ironman hrm with chest strap & cateye mini). Does any one know of the accuracy of my new watch vs. the older units I had been using?