I don't know the answer to that, but I found last night that after I reloaded the new update that I'm rapidly running out of space on the device.
I sent off to Garmin for a solution and also spoke to d00d...
"I updated my software tonight, the last update left me 43MB of free space on the device, now after this update I am left with 29MB of free space. I have deleted all the extra voices etc. that were in the unit to free up space, when I do the next update will I run out of room on the Zumo? What next? Thanks",
Garmin sent me this response :
Thank you for contacting Garmin International.
If you run out of memory on the device, the map update program will automatically detect that there isn't enough space for the full update.
At this point the program will ask you to install a region of the North American map on the internal memory of the unit.
After this, you can use a program called MapInstall, which is installed on your computer during the first update, to install the rest of the mapping to your own SD memory card. I have attached a help guide that shows you how to use the Mapinstall program. After the leftover maps are transferred to the SD card, then the unit will read maps off of its internal memory and the SD memory card (inserted into the unit) at the same time. Please let me know if you have more questions.
With Best Regards,
Adam S
Product Support Specialist
2nd Shift Automotive - Marine Team
Garmin International
913-397-8200
800-800-1020
913-440-8280 (fax) Att: Adam S, Associate #6989
www.garmin.com