I bought this watch and heart rate monitor last week and got really excited about it. As soon as I connected with Garmin Express last week, it stopped writing heart rate, steps, etc data to my iPhone Garmin Connect! It was recording perfectly. I synched it with Garmin Express because I wanted to download new watch faces. The iPhone App did not work.
When I try to view the data through the Garmin Express, same thing-no heart rate data.
Overall, the Garmin VivoActive3 is a nice piece of hardware. The software side needs some work.
Can anyone give some advice to an IOS and MAC OS user? I have a feeling that the Apple Watch works without any hitches. However, the Apple Watch does not do all the cool things that this VivoActive 3 does.