Changes made from version 12.20 to 12.53:
Added GPS + GALILEO support (Activity Settings > GPS). (Requires GPS version 2.20)
Added abnormal heart rate alerts. Enable these in Heart Rate widget > Heart Rate options > Abnormal HR alert. An abnormal heart rate will be detected if your
heart rate exceeds the entered threshold for an extended period of time while sedentary.
Fixed a bug causing Cadence values to be 'stuck' when not pedaling instead of returning to 0.
Fixed a crash seen when viewing SwimRun activities.
Fixed a crash sometimes encountered when selecting apps.
Fixed a bug causing some activities performed on multiple devices to be double-counted when viewing Training Load on Physio TrueUp devices.
Fixed a bug that could cause normal activities to be 'rated' like Garmin Coach workouts and appear when viewing the Garmin Coach widget.
https://www8.garmin.com/support/download_details.jsp?id=11421#Instruct