http://www.garmin.com/support/download_details.jsp?id=877
Changes made from version 6.5 to 6.6.1:
This will be the last version of MapSource to support reading/importing PCX5 files. For future compatibility, please migrate your data to the GPX format.
Updated the GPX Garmin extension (GPXXv1) to version 2 (GPXXv2) based on comments. GPXXv1 will not be supported.
Added Auto option to the display of route avoidances. This will hide route avoidances when the map is zoomed out far enough.
Changed wrecks, obstructions, and isolated dangers to display the corresponding spot depth when it is known. This is enabled by turning on Spot Soundings in the Display preferences page.
Fixed issue performing Select maps around feature when in the No Map product.
Fixed issues with short route avoidances avoiding the wrong places.
Fixed issues with MapSource opening GPX files with Garmin extensions.
Added route road and area avoidances. To access avoidances, select Manage Route Avoidances on the Routing tab of the preferences dialog. Once avoidances are created, they are displayed on the main map if appropriate for the current map product.
Added new large 24x24 pixel waypoint and map symbols. Select these symbols on the Display tab of the preferences dialog. Custom waypoint symbols can now be 24x24 and 32-bit color as well.
Added the ability to show or hide the left hand (user data) pane.
Added tooltips to the waypoint symbol selector with the name of the waypoint type.
Added celestial information dialog.
Added schema extension to GPX for handling Garmin-specific data elements, such as waypoint depth. The location of the schema is documented in outputted GPX files.
Added ability to manually set the Y-axis endpoints on vertical profile plots.
Added rest area find subcategory.
Added artificial reef and oil rig map symbols.
Removed real-time tracking from MapSource. Use nRoute for PC real-time tracking applications.
Made several map rendering performance improvements.
Improved algorithm for selecting maps around tracks and routes.
Improved issue handling while transferring data to removable media and Garmin cards.
Changed MapSource to use Windows XP styles on PCs that support this.
Changed the track vertical profile to use the same graphing style as the route vertical profile.
Change to not display find category types that arent valid for a particular map product.
Change to optimize deleting multiple waypoints from a route.
Change to reduce flickering of pop-ups on the map.
Change to validate trackpoint timestamps before they are sent to a unit.
Change to make user and non-user waypoint dialogs have consistent Show on Map behavior.
Changed waypoint symbol images to remove duplicate symbols.
Change to more gracefully handle the case where a user transferring maps to a Palm doesnt have enough hard drive space.
Changed behavior of toolbar combo boxes to behave more like standard combo boxes.
Change to show stacked pop-up windows over densely packed map features.
Changed behavior of some BlueChart map features to display the name instead of depth.
Change so that GPX route import doesnt always autoname the route.
Changed formatting of Japanese address results.
Changed the default Terrain Shading option on the preferences display page to be on.
Changed vertical profile windows so that they remember their last size and position.
Changed string iQue in Device dialog to Palm OS Device.
Fixed issue drawing selected subsections of tracks on the map.
Fixed issue associated with having Worldmap 3.02 and many newer products installed at the same time.
Fixed issue on the find places dialog with the reset button not properly clearing fields.
Fixed properties for some features not correctly showing their category and subcategory.
Fixed import of GPX files to handle prefixed names.
Fixed parsing of custom waypoint symbol image names to only allow numeric names, such as 003.bmp.
Fixed issue with selecting maps around routes or tracks with only one point.
Fixed issue with some XML files using a large amount of memory to import.
Fixed issue where sometimes columns in the track dialog list control were improperly hidden.
Fixed issue with partial string searching in the name field of the find places dialog.
Fixed find results with elevation information in the name to use the proper units.
Fixed issue related to renaming a route while looking at the driving directions.
Fixed issue with slow UI response while hovering over some areas with the map tool.
Fixed issues related to saving user data on Garmin cards.
Fixed issue in route dialog with multiple selections being ignored when Center map on selected item option is checked.
Fixed issues during map rendering.
Fixed issue while zooming in to a found city.
Fixed issue in the find places dialog with displaying a street name with an & character in the name.
Fixed route speed preferences to set Autobahn speeds to the highest speed category.
Fixed issue with find places dialog field auto-completion in some Asian languages.
Fixed issue with the route dialogs insert waypoint dialog having odd initial selections.