Changes made from system SW version 2.50 to 2.70:
* Added support for HRM-Tri and HRM-Swim
* Added a heading arrow indicator to data pages when in navigation mode
* Added support for 'Auto' backlight mode (options are now available to configure backlight separately for keys, alerts and gestures: Settings > System > Backlight)
* Added support for Walking sport type (Settings > Apps > Add New)
* Added support for configuring LAP key behavior (Settings > Apps)
* Added ability to delete all locations on device (Navigation > Saved Locations > UP (to get to bottom of list) > Delete All)
* Added Back to Start option for straight-line navigation back to activity start
* Added Hot Keys press-and-hold START and BACK key customization (Settings > System > Hot Keys)
* Improved ascent and descent calculations
* Fixed lap banner times for activities longer than one hour
* Fixed issue with display of 3 digit speeds on ski data pages
* Fixed issue with saving of lap ascent values
* Fixed potential issue with steps being lost during an activity
http://www8.garmin.com/support/download_details.jsp?id=9041
Untere weitere Updates:
BLT/ANT Update 3.10
Changes from version 2.80 to version 3.10:
Stability improvements.
Add support for HRM-Tri and HRM-Swim heart rate straps.