Descent MK3 System Software 19.49
Change Log for new Descent MK3 System Software v19.49
New Features:
- Added Tech Diving Fields: FiO2, Diluent PO2, Raw Ceiling, Gradient Factors, TTS+5, TTS△5, Bailout TTS, Gas Density, GF99, ATR, GCR.
- Added Pool Apnea activity.
- Added Auto Dive Snooze capability.
- Added Always-On Dive Display mode (Settings → System → Display → In-Dive → Timeout).
- Added Alipay and Weixin Pay applications.

Source Garmin.com
Improvements:
- Enhanced gauge mode lockout messaging for better clarity.
- Improved dive precheck to prevent palm-press shortcut.
- Enhanced PacePro minimap appearance.
- Improved behavior when scrolling through SubWave message list.
Bug Fixes:
- Fixed low battery alert triggering during sleep window.
- Fixed crash when saving a Tides location.
- Fixed depth and temperature chart display issues.
- Fixed potential crash on Activity Summary page.
- Fixed delay in starting and stopping Pool Apnea activity.
- Fixed incorrect settings appearing for Pool Apnea.
- Fixed in-dive data fields showing on the Apnea surface screen.
- Fixed gas density data field value potentially dropping to 0.
- Fixed several crashes related to maps, data screen editing, and the Garmin Coach glance.

Source Garmin.com