We have a garmin nuvi 255w. We need to know what is the latest map update. Our gps has "CN North America, NT 2010.30" version on it. Is ther something newer than this.

CN North America NT 2015.40 ([1] Lower 49 States NE)
NE = NORTH EAST... California is not in the North East of the United states. This device only has a small internal memory so you need to use a 4 GB memory card and load maps to that card with MapInstall:

How do install mapping to my device with MapInstall

Make sure you didn't just install a portion of the maps. try re-Loading the maps from the Garmin Express program, then check the map info screen by pressing Tools>Settings>Map> Map Info
it should say something like CN North America NT 2015.10, then all, or lower 49 or lower 49 NE (north east) etc

You can buy it here http://www.garmin.com/uk/maps/numaps

Hello,

Using the Garmin WebUpdater will update the operating software.
http://www8.garmin.com/products/webupdater/howtoinstall.jsp

Map updates subscriptions are available as lifetime or onetime updates and are registered to the map that is installed on the Nuvi.
http://www.gpscity.com/garmin-numaps-north-america-lifetime-updates.html

http://www.gpscity.com/garmin-numaps-update-city-navigator-nt-2012-north-america.html

The Nuvi 255w is an older unit and is probably due to be replaced. Once the battery dies on the unit, it can not be replaced easily.

There are a number of Garmin GPSs that come with lifetime map updates.
http://www.gpscity.com/search/q=lifetime/&p=1&c=1&t=Automotive+GPS

You should be able too. You can buy more maps directly from your device or the website. http://www.garmin.com/garmin/cms/site/us/maps

It should unlock automatically.
Try reconnecting your device to computer and going onto the garmin site and get the website to check for updates.
If that fails to work, give garmin a call or send an email to them.
they are normally very quick.
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thanks

To update your nuvi, all you need to do is to connect your nuvi to an internet connected computer and the updates will show on the lower left of your computers screen, click on it and it will update it with the latest software version and maps.
You can also go to your nuvis website and search for latest updates. Just click on the map link and a list will pop up under the map link, select update maps if it is maps you want to update. It will ask you to choose your device from a list, after choosing your nuvi 255w then it will show you the latest maps for your gps, but you have to install its plug ins first.
That is how to update your gps.

You can buy direct from Garmin via this link. You can opt for instant download, purchase of SD memory cards or DVD ROM medium. You may also be able to buy maps at some of the outdoor stores and electronics specialty shops.

If you plan on using this GPS in North America from this point on, you might want to look into purchasing a "Lifetime Maps" subscription for about $119 instead of the one-time map purchase for $79. The subscription allows you do download updated maps up to 4 times per year, for life of the GPS. Contact Garmin Support directly for more info about this option.

contact garmin support.

There should be a small reset switch on the back of most garmin gps units. with the unit on, depress the reset switch with a pen tip or small object until the unit shuts off and restarts. It may take a little longer to pick up the satellite but it will reque the unit and unlock the navigation screen.