Mapsource For Mac Garmin
Simply unpack a mapsource update (see links above), run MAIN.msi and then rename mapsource.exe to something else. e.g. mapsource_6.13.6.exe and then copy it into your main Garmin Mapsource installation folder (usually c:/garmin). Now you can decide which of the two versions you want to use.
Mapsource For Mac Garmin
However Qlandkarte GT is working splendidly with the VeloMaps, and is easy to learn. Only drawback is, that there is no autorouting support for garmin maps (yet). You only need to extract the maps to a folder of your choice then use Qlandkarte GT.
The server has generated four different configurations of your map:* osm_routable_mapsource.exe = Installer for Garmin MapSource (Windows).* osm_routable_roadtrip.zip = Installer for Garmin RoadTrip (Mac OSX)* osm_routable_gmapsupp.zip = Combined image for direct manual placement on the GPS device (gmapsupp.img)* osm_routable_tiles.zip = A zip file containing the tiles in the request, especially useful for Linux users (e.g. QLandkarte)
It does not mention anything about basecamp. I used a VM running winxp and mapsource to do the dirty - when my unit is p[lugged in to the mac and bascamp runs it can read and view the map of hte unit - but as soon as the unit is unplugged the maps are not avaialble.
You can plug in your garmin and make a .dmg (using "Disk Utility") from the SD-Volume (called "NO NAME" on my setup). Store this .dmg somewhere on your hard drive and double click (=mount) it prior to starting base camp.There you have the maps.