https://forums.garmin.com/showthread.php?332685-Fenix-3-6-15-Beta-Rel
Change Log Notes:
- Added support for viewing altitude on the watch face. Note: This requires Display update v2.91, see installation instructions below.
- Further improvements to altimeter and barometer accuracy in watch mode (when not performing a GPS activity). Note: Settings > Sensors > Altimeter > Calibrate or press START from the Altimeter widget to calibrate the Altimeter to a known altitude.
- Improved reliability of Bluetooth manual syncs for certain use cases.
- Fixed potential issues with altitude inaccuracies at low speeds during a GPS activity.
- Fixed a potential issue where the button lock banner could prevent viewing of smart notifications.
- Fixed a potential issue with Wi-Fi syncs.
- Fixed a potential issue with VO2 Max when the Foot Pod Speed setting was set to 'Always'.
- Fixed a potential issue where activity files with HR data would fail to upload.