Mapsource is a map viewing application by Garmin. To install Mapsource you must first install Garmin Training Center.
1. Download and install Garmin Training Center:
http://www8.garmin.com/support/download_details.jsp?id=835
If the Garmin Training Center asks you to connect to your GPS, click EXIT.
2. Download and install Mapsource:
http://www8.garmin.com/support/download_details.jsp?id=209
