I have got a Forerunner XT which has been set up as my device on my Garmin Connect account for several years and is used primarily for running. I have recently bought a Vivosmart HR for general fitness monitoring and set it up as a device on my existing Garmin Connect account on my iPhone. However, when I now log onto my account on my Mac, teh Forerunner is no longer showing and I am not sure how I can set it up as a second device. Can you have two devices on the same account? And if you can, how do I set up the Forerunner as my second device on the website?
Don't suppose there is anything on the Garmin Connect website itself which allows you add a second non-Bluetooth device such as the 310XT.
If you had the FR310XT registered with your Garmin Connect account for years, then it should still be there, unless you removed/retired it. Just check the "devices" sections. It should be also visible in the mobile app in the "devices" section, but if it's not there, then the mobile app cannot be used to register the FR310XT with your connect account.
I was wondering: If you don't have Garmin Express, then how have you been syncing your 310XT so far? Because as far as I know this is the only supported method of syncing this watch with Garmin Connect. That - or the not-supported-anymore ANT agent.