@Brad_Olwin said in Subject: Feedback on Zone Sense accuracy: Short intervals and Zone 2 threshold shifts: I do not know what HR belt you are using. I use Suunto HR belt, and it is reasonably new, perhaps 4-5 months old, and I don’t use it that often. It was the same with Polar H10 before. If I have a truly easy run. ZS remains green. But usually those are Z1 jogs with my dog where we do a lot of stops. But if I am trail running and putting some effort, my ZS graphs are always messed up like in the example above. I think it confuses the muscular stress with the aerobic stress. Aerobically I am well developed and my HR stays in Z1 and Z2 most of the time with occasional Z3 and Z4 and almost never Z5, but according to ZS it is red a large percentage of the time. I guess I am an outlier and ZS simply doesn’t work for me.

@SergioB are there notifications of Suunto App appearing in the iPhone’s message centre?

@MarkG normally there is no issue with activities that long. Hopefully a one off.

@Liviu-Nastasa said in Race 2: GPS, cadence and distance accuracy vs previous Suunto models: @sky-runner [image: 1769344846864-c9ab307b-00f3-4382-ba11-f9b9714e9577-image.png] I run today with a friend wearing a Garmin Epix Pro, his watch measured 14.6km … mine shown 14.44km … the difference seems to be 1.43%. 160m difference in ~14km. Today mi Race 2, 120m less than Vertical in 12,2km. (The sistematic ~1% difference). You can try “distance correction” in Strava (GPX ra distance) and see the difference. May be it wiil be more close to Garmin final distance.

After days of using Race 2 HRV i decided to give a try to Suunto Chest Strap again. Yesterday on shopping i bought new CR2025 batteries different brand (Energizer) I put new battery to strap. Wet electrodes of strap. Connected strap with Race 2 succesfully + get strap on my chest. 100% Chest strap battery. I DIDNT start exercise. I just took off chest strap + I took off sensor from belt, everything was laying separate. Next day I started exercise with strap - it was magically 20% batttery left before I started to run. Lost 80% during 24h without using it and having sensor taken off from belt with dry strap so its impossible it could work anyway + battery should last 500h. Next day I started running exercise with 20% battery in sensor, ended up and magically Race2 shows it got 30% battery left Did 40 minutes gym session - still 30% battery. Now i know its not batteries fault. Its sensor from strap/Race2 software that reads wrong battery status or problems with connecting BT. or watch itself. Its my probably last try and post, just wanted to give a info

@Charlie-Needham Totally agree. The flow with Suunto Race for me is quite better. Already had several issues with different activities finishing them by accident.