How do I update the map material for the Navigator VI?

To update the map data for your Navigator VI, install the "Garmin Express" software on your computer. Here you will find all information on installing the program from point "1. Install Garmin Express":
Among other things, you will find installation instructions and information on how to update the maps on your device. Simply connect your Navigator VI to your computer (via USB cable), start the "Garmin Express" program and follow the instructions for the map update.
 
"Garmin Express" is available for PC / MAC.