Available currently only via web-updater

http://www8.garmin.com/software/Colorado400t_270.exe

Changes from version 2.60 to version 2.70:

Improved accuracy of altimeter for large altitude changes.
Fixed text writing on top of itself in some geocaches descriptions.
Fixed freeze when loading some geocaches descriptions.
Fixed issues with power off pressure trending.
Added support for downloading geocaches written using Groundspeak v1.1 extentions.
Improved map drawing performance in some situations.
Fixed 3D View not showing detail from supplemental maps.
Fixed waypoint and geocache symbols not updating on the map after being changed.
Fixed issue where the Colorado would temporarily stop responding after a spell search.
Fixed issue with elevation over time plot.
Fixed issue with position format not saving over power cycles.
Fixed issue with display of selected location config field.