Question about Garmin nuvi 350 GPS Receiver

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Garmin novii 250

Cannot fit the UK maps in my garmin 250. If I delete gmapprom.img which contains Australian maps, then the unit gives an error on start, saying that no usable maps can be found.

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Re: garmin novii 250

You can transfer the UK maps to an SD card which you can then insert into the Garmin. This way, you'll have both UK and Australian maps on your GPS. Got to Setup to choose which map you want to view.

Posted on Nov 06, 2008

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Unfortunately deleted the maps suppled withe the device.Hve obtained the basemap and sum file on dics from garmin and have loaded it to the device however the maps are not showing up.Have downloaded...

The base map will just give you major highways. You are missing the gmapprom.img file which supplies all city streets. The sum file is not used and is only a checksum file to insure that the basemap was downloaded without errors. The map file, depending on year can be anywhere from 1 to 2GB in size and too large to be sent by email. In addition, you will need an unlock code file to activate the map on your unit. More info can be found here:

Oct 23, 2013 | Garmin nuvi 205 GPS Receiver

1 Answer

Can not activate nuvi 350. gives: No Map Available..

Connect your unit to a PC and look in the Garmin directory for the following files:

gmapprom.img - ~1GB file size
gmapprom.unl - map unlock file

If these files are missing or if the map file size is much smaller than 1GB then they will need to be replaced. Also check to make sure that your map is not turned off. Go to the map menu screen and make sure that the map is checked (turned on).

If you can need further help, please see this link for further help:

Mar 23, 2013 | Garmin Nuvi 350 Car GPS Receiver

1 Answer

Garmin Nuvi 1350 showing on screen "no map data available"

Shut off the nuvi.

Remove any memory card (if equipped) from your nuvi.

Plug the GPS into your computer via USB cable.

Open the Garmin "drive" icon in "My Computer"

Navigate to the x:/Garmin directory or "folder" (where "x:" is the drive letter assigned to your Garmin). Locate either map files set(s) named: gmapsupp.img or gmapprom.img.

Some units store map files in the hidden x:/.System directory instead. To view the .System folder and contents, you must direct your computer to display both the "system" and "hidden" files.

If you lack large files named either gmapsupp.img or gmapprom.img (about 1 GB or more); your maps are missing from the internal memory of the nuvi and will need to be reloaded.

If you pulled a memory card above, reinsert it and check the directories for the same gmapsupp.img or gmapprom.img files. If they're not present there, the maps should be reloaded.

I hope this helps

Sep 15, 2011 | Garmin nuvi 1350 Car GPS Receiver

1 Answer

I bought a lifetime update from Garmin a few years ago but now my nuvi 270 tells me that I don't have enough memory to install the latest maps and that I must choose only certain regions. I have an 8Gb...

The internal memory of the nuvi is full. Some maps will need to be delete before any new maps can be added. Typically, the map in the nuvi is named GMAPPROM.IMG and a map installed to an SD (or SDHC) memory card is named GMAPSUPP.IMG.

1) Remove the SD card from the memory slot

2) Connect the nuvi to the computer via USB cable.

3) Open the nuvi drive.

4) Locate and delete the GMAPPROM.IMG (or GSUPPROM.IMG) file(s). Optionally copy (instead of deleting) them to your hard drive in case there is a problem wit the new map file(s).

5) Empty the Recycle Bin.

6) Retry the map update of the nuvi.

This method will take some time to perform depending on how many map segments you are sending to the nuvi. Transferring the entire map can take over an hour. A quicker way is to send the maps to the SDHC card directly by inserting the card into a card reader. This eleminates the slow Garmin card reader from the equation and transfers are done in a fraction of the time. No maps will be on the nuvi - they will all be on the memory card instead. To update the SD or SDHC card, do this:

1) Repeat steps 1 thru 5 above. This removes the maps files from the nuvi.

2) Disconnect the nuvi from the computer.

3) Connect a card reader to the computer.

4) Insert the SD or SDHC card into the reader.

5) Locate and delete the GMAPPROM.IMG (or GSUPPROM.IMG) file(s). Optionally copy (instead of deleting) them to your hard drive in case there is a problem wit the new map file(s).

6) Update the map to the SD or SDHC card.

When either method is employed, only one map file set will result. GMAPPROM.IMG or GMAPSUPP.IMG is the name of this file set. You should ensure / change the name to GMAPPROM.IMG. Any subsequent file set added should be named GMAPSUPP.IMG.

I hope this helps & good luck! Please rate my reply - thanks.

Jun 27, 2011 | Garmin nuvi 200W GPS Receiver

1 Answer

I have lost all UK & Europe mapping - except for major roads. This was initially built in to unit. Have SD card for Australia & New Zealand - this works fine.

The maps are stored in specific mapset files with *.img extension in the flash memory of the GPS unit. Each mapset file contains one or many maps in it. Beside that, the Garmin GPS navigator can also recognise and load up one additional mapset file from SD card residing in the "Garmin" folder and named as "gmapsupp.img".

Here are the mapset files supported by Garmin Nuvi 255w GPS navigator:
  • gmapbmap.img - the default base map
  • gmapprom.img - the primary mapset
  • gmapprom1.img - the secondary mapset
  • gmapoem.img - the OEM mapset that cannot be unselect by user (if it exist)
  • gmapsupp.img - the supplemental mapset which you can have one in the GPS flash memory and another one in the attached SD card.
Therefore, the Garmin Nuvi 255w GPS supports up to 6 mapset files, including 1 in SD card. Normally new maps installed by the user will be stored in gmapsupp.img.

You will lost all the maps in the previous mapset file if it is overwritten by a new file with same filename. If you want to keep the existing maps, ensure that you store the mapset file with an unused filename (from the 5 filenames above). Alternatively, you can make use of special tools to merge new maps into existing mapset file.

You can view the name of your base map in Tools > Settings > System > About > Basemap.

You can view the name of maps in the other mapset files in Tools > Settings > Map > Map Info. There, you can tell the GPS to load the map by checking on its name, or not to use the map by unchecking it.

In case there are 2 or more non-overlaping maps available for the same location, the map with the highest priority number (defined in the map itself) will be used by the GPS.

Note that certain map which are locked by vendor need a 25 bytes unlock key stored in a *.unl file in the same folder and with the same name as the mapset file where the locked map is stored in.

You might probably also interested to read:

Mar 13, 2011 | Garmin nuvi 255W GPS Receiver

1 Answer

Garmin c510 error message "No detailed maps found that support routing. The streetmap cannot be used without them" Don't have pin number! Solution?

You're unit is probably missing the gmapprom.img file (failed update maybe?).

Try contacting Garmin - if you've got registered maps they may send you another copy (although big file - 100+MB)

Aug 14, 2009 | Garmin StreetPilot c510 Deluxe GPS...

1 Answer

My Garmin gps is frozen on a screen telling me there are no maps found. I tried to reset it and put a memory card in it but nothing worked so far. Any ideas?

You're missing the file gmapprom.img on your C510 unit (possibly a failed update?).

Unless you have a backup it's contact Garmin I expect (maybe try getting a copy off someone but possible the file is locked to the unit as I have tried swapping SD cards containing maps in the past between units and no joy)..

Jun 04, 2009 | Garmin StreetPilot c510 Deluxe GPS...

2 Answers

Lost maps in garmin nuvi 200

Form Message You need to have Garmin Tech support send you this attachment; "gmapprom.unl" Then follow the instructions below.

1.) Save the attachment from our message to the desktop
2.) Right-click the file gmapprom.unl, and click copy
3.) Click on My computer
4.) Click on the Garmin Nuvi drive
5.) Click on the Garmin Folder
6.) Rightclick a blank white space in this Garmin folder
7.) Click Paste, and note gmapprom.unl file is listed, please also delete gmapsupp.img if present
8.) Unplug the device, and allow to start up

Nov 04, 2008 | Garmin Nuvi 350 Car GPS Receiver

3 Answers

Uploaded Map Update 2008 City Navigator North American NT now maps locked

I held on the phone with Garmin for about 2 hours, but they fixed my unit, PATIENCE!

Oct 19, 2007 | Garmin StreetPilot 2720 GPS Receiver

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