Connect IQ Store link: https://apps.garmin.com/en-US/apps/24cca815-d19a-4e7e-8560-c1a1b7eefec3
Major improvements over the built-in Temperature widget (on D2™ Bravo):
- works with the Garmin tempe™ external sensor (REQUIRED)
- temperature and altitude units are configured independently from watch settings
Drawbacks:
- cannot display temperature from internal watch sensor when no Garmin tempe™ sensor is found (due to Connect IQ limitations)
- cannot be used during an activity (this is a limitation of the watch)
- no access to mix/max temperature values from the tempe™ sensor (this is limitation of Connect IQ in the way the tempe™ is accessed but I may change this in the future if there's demand)
Technical Details:
- The density altitude calculation is done using the dry air formula (dew point is not taken into account). You can read more about the various calculations on the "Density altitude" Wikipedia page.
- The density altitude calculation is only as accurate as the data from the watch. The calculation uses the elevation (altitude) returned by the watch, which (at least on the D2 Bravo) is based on the barometric pressure and then adjusted using the altimeter setting (QNH) from the nearest METAR -- this is all done automatically by the watch.
- The density altitude calculation is only as accurate as the data from the Garmin tempe sensor. If the Garmin tempe is missing or hasn't had time to accurately reflect the ambient temperature then the calculation will be incorrect.
Back story:
After attending a recent Garmin Aviation webinar, I purchased a Garmin tempe™ (external temperature sensor) to go with my D2 Bravo watch. The webinar presenter had mentioned that the tempe™ would work with the built-in Temperature widget and provide a more accurate temperature reading and as a result a useable density altitude calculation (it's a pilot function added to the D2 Bravo's Temperature widget). However, after pairing the tempe™ to my watch I discovered the nice graphical display on the widget was replaced with a simple display of temperatures from the external sensor and no density altitude calculation. And according to this thread in the fenix 3 forum, others aren't too happy about similar loss of functionality when using the tempe on their F3s.
