Garmin maps

This post unifies all Garmin maps and information about these, any change/update on these or info will be updated here and linked from the various posts that have references to Garmin maps.

Types and map names

gmapbmap.img Basemap. It’s not is a map properly speaking with roadways and other details, but it’s an overview when is used a wide zoom out. Is preferable not erase because can be needed it to show a long route. Is preferable not erase it because can need to display a long route
gmapprom.img It’s the map that comes preinstalled on GPS, so this file will no work on SD card.
gmapsupp.img Additional map that can be loaded on GPS, this one can be found on websites.
gmapoem.img Active map always, can’t uncheck from maps list.
UNL files Files with unlock codes for the maps.

There is ability to add more maps, but usually I don’t use many maps at same time so I did not ventured beyond. The maps names to being considered are: gmapsup2.img, gmapsup3.img, gmapprom1.img, etc, and is usually important if are present on device or SD card. If you’re interested send me an email (its on my profile) and I’ll pass you the links.

Available maps

Garmin wants to completely change their devices and their files, especially, a new system -for devices after 2014- for which are only allowed downloaded maps with digital signature from Garmin’s servers.Depending on the model just have to add a file or flash a modified firmware:

Full compatible devices with NTU maps: (PDF)

Iberia NTU 2018.10 [unlocked]
Help for download?
Europe NTU 2018.10 [unlocked]
Help for download?
Europe NTU 2018.10 JCV
Help for download?
Europe NTU 2018.10 Adicc
Help for download?

As I offered for first time NTU maps some older devices may have problems with address search, although the maps are displayed correctly. It’s a pain that the NT amps not be updated at same speed and same periodicity.

Iberia NT 2018.10 [unlocked]
Help for download?
Europe NT 2018.10 [unlocked]
Help for download?
Europe NT 2018.10 JCV
Help for download?
Europe NT 2018.10 Adicc
Help for download?


Other maps?

  • Proyecto Mapear :
    They have maps of Argentina, Uruguay, Chile, Paraguay, marine charts, routes, tracks, etc. Is required login…but if you need it worthwhile.
  • OSM maps in Garmin format:
    Maps anywhere in the world routeables and frequently updated. You can download provinces, countries, continents. Think yourselves that the maps are made by volunteers: will be more precise in populated areas; in setoff will have cycle routes, walkways, focus to pedestrians, etc.


Where’re the maps?

The maps are only in two locations :\.System that is a hidden folder and :\Map used by newer devices. To “see” the folder .System there’re two ways:

  • The normal one. On Windows Explorer execute the command Tools; Folder options tab View and check Show files, folder and hidden drives.
  • Cut the bone. On Windows Explorer go to GPS device (e.g. K:\) and on address bar add “.System” (K:\.system) and press [Enter].


Update an existing map.

To update the maps just to replace the existing one (a .IMG file) by the new one: a copy-paste, paying attention to not delete or overwrite gmapbmap.img, the base map.

With one map is easy, delete the existing one and put the new one (gmapprom.img or gmapsupp.img), in case that have another name type the old name. Turn on GPS and it’s done. In case having two or more maps can use PGFT to know which map is each.

For this go to Protected IMG File tab, push on File and on Mapset will display the map title. Also must to keep the name of previus file. Once transferred the maps, turn on GPS and it’s done.

Remember that must to have specified names, otherwise the maps will not appear. look the headland Maps names.

Add a map.

To add a second map have to make a difference between the main map gmappprom.img and the secundary gmapsupp.img, so would name the maps according with this. This would be the internal memory, since in µSD card only can put a single map gmapsupp.img.


7 pensamientos en “Garmin maps

  1. luis

    hola estoy tratando de usar un mapa qe compre en el internet y lo instale en un gps pero cuando lo voy a instalar en oto gps no me deja y basecamp dise que no esta bloquiado por faor si uede desirme porque gracias

    1. Obiwan2208 Autor de la entrada

      Por lo que parece el mapa esta limitado a un GPS en particular, eso ha sido así desde el inicio de Garmin. Si saber que archivos te han dado exactamente y el modelo de GPS no se si esta limitado por .UNL, .GMA o firma digital.

      1. luis

        Bueno esto es lo que vino en el archive
        66600024.img (esto es in unzip 10016kb)
        Dominican republic.img (winzip 13KB)
        dominicanrepublic.MDX (MDXfile 1KB)
        dominicanrepublic.TDB (TDBfile 1KB)
        dominicanrepublic_MDR.img (winzip 960KB)
        unins000.dat (datfile 7KB)
        unins000.exe (application 702KB)
        quisiera mandartelos pero no puedo

        el gps mio es 205 nuvi co espacio para tarjeta mini de dato

        1. Obiwan2208 Autor de la entrada

          Parece el instalador clásico de mapas para Mapsource/Basecamp…pero no del todo. No suelen ofrecer los mapas ‘a pelo’ (66600024.img) sino que lo hacen a través de muchísimos .IMG o -creo recordar- embebidos en archivos .CAB

          Mira a ver donde esta el mapa (gmapprom.img o gmapsupp.img) sino hay uno o varios archivos con el mismo nombre: p.ej. gmapprom.img y gmapprom.unl.

          Para la próxima vez hay servicios para enviar archivos grandes de forma gratuita como

          1. luis

            estos mapas yo lo compre de in website llamado gpsetravelguide, este es el numero 597429. no garmin pero som para garmin. dejaver si puedo mandar el erchivo complete.

            1. Obiwan2208 Autor de la entrada

              Por lo que he visto están especializados en mapas poco comunes aunque no explican de donde sacan los mapas, quiero decir alguien con mas medios hace la cartografía en esos países.

              Pasa el archivo 66600024.img a través de PGFT por si esta bloqueado, pero haciendo uso de algún archivo .UNL (+info:

  2. Obiwan2208 Autor de la entrada

    All links are updated!

    I chose by getting rid of all obsolete versions, leaving only the most recent; compiled, uploaded, the same as JDCs and posted links, pheww.



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