Garmin Navigator 2019.10 maps, released 03/07/2018
Current as of 03/09/2018

CN North America NT 2019.10 Full Coverage of North America

Works on my 255w, and should work on all older units that don't check for cracked maps

Some devices only work with older non SDHC SD cards, 4GB-8GB in size. If it doesn't
work, try a smaller SD card.

If your Garmin has enough internal space:
Rename gmapsupp.img to gmapprom.img and replace it with the one that is on the internal
memory.

If your Garmin doesn't have enough internal space, or you don't want to delete the original
maps:
1) Format an SD card as FAT32
2) Make a folder on the SD card called "Garmin" (without the quotation marks)
3) Copy gmapsupp.img to the Garmin folder on the SD card

Once the unlocked maps are on your device, and the SD card is inserted, turn the device on
and make sure the new maps are selected under Tools>Settings>Map>Map Info

You can also get it to work on newer devices by patching their firmware following this guide:
 
http://www.navitotal.com/topic17987.html

Once your newer device has the firmware patched, you can use my maps on all Garmin devices