I have a new 945, been using it for 2 weeks now and HRV, Stress VO2 max are not working.... frustrating!
I bought a TRI HR Strap to try it out with the strap but no better luck.
I have the feeling Garmin, once again, realised and item that was not 100% ready and that we, the early users, are beta testers!?
Let's hope we'll get a firmware update rapidly and that things will be sorted out?
If one of you has a solution please do not hesitate ...