Thread: City Navigator North America NT 2012.10

Originally Posted by jermy4

I restored back my old maps/jcv and it still doesn't work

why take the risk with every update or holiday?
just put the updates on a SD-card !

get the nuvi to work properly, restore to previous or original map data
- on a 7x5 you have:
* gmapprom.img [unlock it]
* gmap3d.img [works only with the right gmapprom.img AND unlock it]
* gmaptz.img [don't need updates, unless the government changes the timezones you live in]
* gmapbmap.img [get a worldwide autoroute version (=50MB) if you have a americas or atlantic version]
* JCV/xxxxxxxx.jcv [works only with the right gmapprom.img]

additional maps [if any internal space left]
* gmapprom1.img [any map you want, maybe a local TOPO map]
* gmapsupp.img [any map you want, maybe a holiday or travel map]
keep at least 10 to 25 MB FREE space [needed for system updates etc.]

Updating your maps:
It is almost the same as updating the internal maps, but it is faster and more safe.
- note the difference in img-file names
- you may also put other maps on the SD-card [america, europe, azia, africa, TOPO-maps or any other holiday destination]
- have multiple SD-cards with different map-sets or versions
- safe: if you don't do it correct just remove the SD-card and the nuvi still functions

Get a 4GB SD-card:
- format it to FAT32 [no FAT, exFAT or NTFS]
- files to put on it [see post 1]
- [SD]\garmin\gmapsupp.img [make it yourself with mapsource or get one somewhere]
- [SD]\garmin\gmap3d1.img [rename a unlocked gmap3d.img to gmap3d1.img]
note: you may only have 1 gmap3d1.img file [internal OR on SD]
- [SD]\garmin\JCV\xxxxxxxx.jcv

-put the SD-card in your nuvi and turn it on, if maps don't show reboot once more
-go to the Map Info page and select/deselect the map you want