Hi, all.
- I have the 935, and get really good HR data from my wrist. I also have a chest strap which I sometimes use for biking/rowing, but don't wear it running because I just can't get it stable and it actually gives worse data.
- I'm doing an Ironman soon, and because of the age of the watch and my time, I want to "top off" my battery toward the end of the bike, necessitating me taking it off (because of the charger placement). Thus I'll obviously lose wrist HR capability during this time.
- So my plan is to wear my chest strap during the bike, at mile 70 take off the watch and charge it to the end of the bike ride, and in T2 put the watch back on, take off the chest strap, and go on my marathon.
- My concern is: will the watch know to switch to wrist HR once I take off my chest belt to which it had been paired in the same ongoing activity?
- So today I did a test on my bike: I wore my chest strap, at the halfway point I took off my watch and charged it in my bento box, at about the 75% mark I put the watch back on and put my chest HR strap in the bento box. From here on I got HR data, but it was very weird (much too high). Previous rides my HR is nearly even the whole ride (it's pretty flat here). This is my ride if you want to see the HR data: https://connect.garmin.com/modern/activity/5429126815
Any thoughts what might be going on? Was the chest strap sending bad data from the bento box? Does the watch not "calibrate" or something if it switches HR source mid-activity? Other? I still have time to do other tests. And honestly, I could do without HR data on the bike (I pace by power) but I REALLY need good HR data on the run. I could forgo the chest strap entirely, but would still need to know that I can take my watch off and put it back on during the event and the HR will resume picking up accurately.
