Answer provided by Garmin Help.
To free up more space on your nuvi 200, 205, 300, 465, 500, 5000, 600,700, 705, 800, 805 series, StreetPilot C500 series, and zumo 220, 450, 550, 660, 665 series you must remove unnecessary files, please follow the steps below:
Connect the nuvi, StreetPilot, or zumo the computer with a USB cable.
Find your My Computer icon and double click on it or you may find it in you Start menu and click on it.*
Double click on the Garmin drive listed under devices with removable storage
Double click on the Garmin folder
Double click on the Voice folder
Delete any unused voice language (be sure to keep your preferred language).
Return to the Garmin folder
Repeat steps 5-7 with Text and Help folders
After the files are deleted please empty the recycle bin or trash. Once completed please run the map update again.
*Mac users can skip this step
To free up more space on your nuvi 1100, 1200, 1300, 1400, 1690, 1695, and 3700 you must remove unnecessary files, please follow the steps below:
Connect the nuvi, StreetPilot, or zumo the computer with a USB cable.
Find your My Computer icon and double click on it or you may find it in you Start menu and click on it.*
Right click on the nuvi or Garmin drive listed under devices with removable storage.
Click on Explore.
Show hidden files. Please follow the link for steps on how to show hidden files: http's://buy.garmin.com/support/productSupport/kanaCase.faces?case=28f8d160-10e3-11df-d31c-000000000000
Double click on the Garmin folder
Double click on the Voice folder
Delete any unused voice language (be sure to keep your preferred language).
Return to the Garmin folder
Repeat steps 5-7 with Text and Help folders
After the files are deleted please empty the recycle bin or trash. Once completed please run the map update again.
*Mac users can skip this step
