I'm not 100% positive, even though I switch between devices. Typically if I'm using the Garmin for the day (or part of it), I won't close the ring because of the background activity I miss or I just won't care because I'm wearing the Garmin. But, I'm 95% that activities do work on the rings. I swear that I've had rings close after a big workout the moment I put the AW on.
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This is a hard question. The answer is certainly not as good as the AW, which is excellent, but most of the time OK, yet, not good enough. On the other hand, I find the AW's tendency to have me walking down the middle of the road a problem too (although right now I could safely do that).
I think I wrote about it here but I had an event of some sort about a month ago. It's 99% that it was a gallbladder issue (I'll probably lose mine) but there was slight heart rate wonkiness on the Garmin that causes me to question the diagnosis. Basically, my heart rate hit 130 in warm ups, really light warm ups, barely more than walking. I've hit that before but I was barely moving so it shouldn't have gone that high, probably. I've also had weird spikes when working out, like my heart rate jumping to 180 when it should be 140 or less.
The thing is, the Fenix is known to have oHR issues. Spiking, up and down, is a common complaint, so my issue is almost certainly a Garmin issue, but you get the problem, I don't know what's right and it's fair not to trust the oHR 100%. I have a chest strap and arm strap now.
Accuracy issues on the Fenix that I know about include,
- PulseOx: Typically about 2 to 3 percent lower than finger reader.
- Sleep: Mostly good, but sometimes, will record sleep with the watch off.
- oHR: Can be spiky and wonky.
The oHR is also limited by the band and size of the watch. The AW is a really good fit, which is probably a part of it's oHR accuracy but the Garmin is big, bulky and can be tough to get the fit just right. This probably affects oHR.
Weird spikes don't really matter, because they'll mostly average out, but they are freaky to see when other things are happening and a gallbladder attack is scarily like a heart attack.