http://www.garmin.com/support/collection.jsp?product=010-00567-00
Changes made from version 3.10 to 3.20:
Add support for coordinate entry in alternative grid formats
Maintain zoom level when panning from main map
Correct Extended Postal Code searching error in the UK
Correct shutdown when import waypoint with unsupported symbol
Correct import of certain route points with MapSource 6.12.2
Correct issue that prevented trip log archive function from activating
Still no fix for auto route re-calc & auto zoom
Hey, why should I worry, I've a 276c
Changes made from version 3.10 to 3.20:
Add support for coordinate entry in alternative grid formats
Maintain zoom level when panning from main map
Correct Extended Postal Code searching error in the UK
Correct shutdown when import waypoint with unsupported symbol
Correct import of certain route points with MapSource 6.12.2
Correct issue that prevented trip log archive function from activating
Still no fix for auto route re-calc & auto zoom
Hey, why should I worry, I've a 276c