Temp sensor

[Discover]

Please see H1 english v4 manual page 65th "Temperature: The temperature of the air. Your body temperature affects the temperature sensor. Your device must be connected to a tempe™ sensor for this data to appear."

[JungleJim]

The Tempe sensor works with the H1, but the temperature data is not stored in the recorded activity.

[Discover]

Garmin Support answer:
Where the 66SR may have done this automatically, the GPSMAP H1 requires you to set up a data field for temperature for the activity profile once your Tempe sensor has been connected.
I made it, but no temperature in the FIT file

[GPSrChive]

I think you will discover over time that most Garmin support staff have very little knowledge about the products they are supposed to be helping with.

I suspect the FIT file Tempe data issue will be resolved soon.

[Maver]

The Tempe sensor works with the H1, but the temperature data is not stored in the recorded activity.

The issue is locating where the sensor is still available.

[JungleJim]

The issue is locating where the sensor is still available.

That's true, Garmin doesn't produce and sell the Tempe anymore. So if you're lucky you can maybe find a retailer that still has some stock or someone selling a second hand Tempe on eBay or other marketplaces, but chances for that are quite slim I believe.

Alternatively you could look into the RuuviTag or RuuviTag Pro, and the (paid) ConnectIQ Data Field that's available and compatible with the H1. I personally don't have any experience with the RuuviTag, so I can't tell you how well it works.