I use the 265 with the HRM-Pro+. I got to the gym, put the strap on, start a strength activity on the watch, put the watch into my locker, When I've done working out, I stop the activity on my watch, and download HR data. It completes it successfully, When when going into the activity, it's lacking a LOT of data.
It's not not zone'd it all correctly and thrown the calories away. The HR data reported is not accurate/complete.
This is the activity in question: https://connect.garmin.com/modern/activity/11295573614
I'm attaching a screenshot of the HR from that day so you could see the difference: HR Screenshot
However, when I use the 265 with the strap together, the data is more 'complete'? Not sure what's going on here. As I understand I can use the strap alone and then download the data when I'm done and it should work fine.
This is an activity done together with the 265 and the strap on me: https://connect.garmin.com/modern/activity/11347681579
Any idea?