Will the 2014 maps fit on my Nuvi 660?
How much free space is on your 660 now and what map version is currently installed?
Have you gone in and removed unneeded files from your 660 (foreign language voices, etc.)?
When you try to update your 660 to a new map update and get a "all of North America won't fit--what portion of the update do you want to install?" notice, you'll know for sure that the entire map update won't fit on your device.
But you can still install all of North America to your 660 with a SD card with a bit of extra effort:
My only GPS is a Nuvi 660.
Prior to the last map update, by removing every UN-necessary file from the 660, yes, it would JUST Barely fit..
With the last map Update... NO... IT WILL NOT FIT!
You can have the map load and run off an SD Card in the 660....
Somewhere here there is a step by step FAQ on this...
IT DOES WORK... It will even work if you use music on the SD card simultaneously!
I've used it with Mode 4, 6, 8 and mode 10 SD Cards (Up to and including 16Gb).... here Mode 8 and 10 seems faster than 4 or 6, but not everyone agrees on that.
Seeing that I've tried this on muliple cards (This card will "look" to Garmin Website as your GPS, so it will download to USBV2 Card reader faster than USBV1 Nuvi 660)
I have one card in the 660 for operational, a second for updating, and I left the last maps on the nuvi (I never deleted them).... So upgrades are faster and I can always shut it down, pop out the card and reboot and used maps from early last year (or another SD card) so I can quickly test differences between map versions (though I've not had to try it)!
I hope this helps.... Hopefully someone will post link to the step by step innstructions....
It's on FAQ, for multiple type units... BUT
I'd suggest looking for anandb's post in this thread,as it is 660 specific:
I have Lifetime Maps on my old 660 and have no problem keeping it up dated. I sometimes think its easier than doing my 3790. There is a card in it but I'm sure the maps go on the device. This last time I used Garmin Express and it went quickly. No update has given me a problem.
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