Edge devices: Logging Raw GNSS (GPS) and barometric data

You have access to elevation data during an activity (Activity.Info).
But barometric elevation (the usual source for Edge devices) is based on the calibration before starting the activity.

var altitude as Lang.Float or Null

If you want to log the GNSS data that is possible, and if it's about altitude, then my guess is that the "regular" altitude you'll get is from the barometer, so you'll be able to log both probably.

Position.enableLocationEvents(GNSS.options, :onPosition);

function onPosition(info as Position.Info) as Void {
  // use what's in info.altitude (I think it can be null)
}

 flocsy (237419224e814eb7be09ba868d70607f) thank you for the fast and detailed answer.

The code example is much apriciated. 

 mcinner1 

Igues 'altitude" returns the baromtric elevation after calibration at beginning and is equivalent of what is available through the .fit file, correct? 

Last question:

Where is the best place to read about functions like "position" or "altitude", retuning raw or corrected values like above? 

Cheers!