I have owned a GPS Map 176, 276 and 478 and have, until recently, used Mapsource as my mapping program of choice. I recently changed to Basecamp and also purchased a Zumo 665 which had its own maps preinstalled. I then went to purchase a copy Navigator for my computer as I had done 3 or 4 times previously except to find that the map I purchased was installed on my Zumo instead of my Mac laptop and only appears on the computer copy of Basecamp when the Zumo is attached. This is clearly a royal pain as I cannot do routing on my laptop without the Zumo.
I paid for a map for my computer I don't understand why it got installed on the Zumo.