What should I do if my Garmin nuvi, LIVE, dezl, Camper/RV, or zumo device displays the message "No Detailed Maps Found That Support Routing" or "No Map Data Available?"

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The "No Detailed Maps Found That Support Routing" or "No Map Data Available" message may appear on your device for the following reasons:

  • The maps on the GPS device have been disabled
  • The GPS device is missing its unlock code
  • An unsuccessful map download attempt has written the mapping files incorrectly
  • If a microSD / SD card is being used and is in an improper format1

To determine the cause of the message, touch and hold your finger on the screen until the message "No Detailed Maps Found That Support Routing" disappears.

  • If you see a "Can't Unlock Maps" message following this error, remove any microSD / SD cards in the device and follow the instructions below for "Retrieving Your Unlock Codes" followed by the instructions for "Creating an Unlock File."2
  • If you do not get the "Can't Unlock Maps" message then skip to the instructions for "Enabling Maps on the GPS Device."2

1When downloading information to a microSD / SD card, the card should be in FAT or FAT 32 format. For more details on formatting and instructions on how to format, please see the article How do I format a microSD/SD card?

2If you have a nuvi 55, 56, 57, 58, 65, 66, 67, 68, 2405, 2407, 2408, 2505, 2507, 2508, 2509, 2609, 2707, 2708, 2709, 3400, 3500, or 3507 series, zumo 350, zumo 390, zumo 590, Camper/RV 760, or dezl 570, 760, 770 device, please contact product support instead of proceeding to the indicated section of the article.

Enabling maps on the GPS device:

  1. Touch Tools
    • Skip this step on some devices
  2. Touch Settings
  3. Touch Map or myMaps
    • Touch Map & Vehicle before this step on some models
  4. Touch Info or Map Info
    • Skip this step on some devices
  5. Select the checkbox next to the maps to be enabled on the device3

3If this page is blank and you have recently attempted a map update, you may need to download the map again.

Retrieving Your Unlock Codes:

  1. Log into your myGarmin account at http://my.garmin.com
  2. Click on the myMaps tab
  3. Click on the Details link next to your device
  4. Locate the most current unlock code for your device underneath the Installed Maps heading

Creating an Unlock Code File for PC:

  1. Connect your Garmin device to your computer with a data transfer USB cable
  2. Double-Click on My Computer or Computer located on the Desktop or in your Start Menu
  3. Right-Click on the Garmin drive
  4. Click Explore
  5. Double-Click on the Garmin folder
  6. Right-Click in a blank space in this window
  7. Move your mouse over the word New
  8. Select Text Document
  9. Press Enter / Return on your keyboard
  10. Double-Click on the New Text Document. This will open the New Text Document in a window called Notepad
  11. Type the unlock code that is listed in the Manage Maps section of your myGarmin account in all capital letters with no spaces or symbols
  12. Select File
  13. Select Save As
  14. Change the Save As Type to All Files
  15. Type gmapprom.unl in all lower-case letters for the File Name
  16. Select Save
  17. Close the Notepad window
  18. Delete the file named New Text Document
  19. Disconnect the GPS device from your computer

Creating an Unlock Code File for Mac:

  1. Connect your Garmin device to your computer with a data transfer USB cable
  2. Open the TextEdit application located in the Applications folder
  3. Click Format
  4. Select Make Plain Text
  5. Type in the unlock code that you retrieved from your myGarmin account. The unlock code should be in all capital letters with no spaces or symbols
  6. Click Save As and name the file: gmapprom.unl
  7. Uncheck the box "If no extension is provided, use '.txt'"
  8. Save the file to your Desktop
  9. Double-Click on the Garmin device icon that is mounted on the Desktop
  10. Double-Click on the Garmin folder
  11. Copy the gmapprom.unl file from the Desktop to the Garmin folder on your device

Those devices which are preloaded with transatlantic (North America and Europe) mapping will need to follow the Creating an Unlock Code File instructions above for the North America mapping and then create another unlock file for their European maps. The European unlock code file should be named gmapprom1.unl.

If your device is a nuvi 30, 40, 42, 44, 50, 52, 54, 1100, 1200, 1300, 1400, 1690, 2200, 2300, 2400, 3700 series, LIVE 1695, LIVE 2300 series, zumo 220, 665 or dezl 560 device, then the gmapprom.unl file is required to be placed in the ".System" folder instead of the Garmin folder. The ".System" folder is a hidden folder in the Garmin drive. To access the hidden ".System" folder, please follow the steps below:

On Windows:

  1. Press the Windows + R key to open the Run window
  2. Type control folders
  3. Click Ok
  4. Click the View tab
  5. Select the Show hidden files, folders, and drivers box
  6. Unselect the Hide protected operating system files (Recommend) box
  7. Click OK to apply the changes

On a Mac:

  1. Double-click on the GARMIN device icon on the desktop to open
  2. Click the "Go" menu option at the top of your screen in the menu bar
  3. Click "Go to folder..."
  4. Type ".system" (without the quotes and in lower case letters)
  5. Press OK

The .system folder will now be present in the folder list.

If you continue to receive the "No Detailed Maps Found That Support Routing" message after completing these steps, please contact Garmin Support.

Links referenced in this article:

How to format a microSD/SD card article:


Contact Support:


Map Reinstall:


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