Question about Garmin Nuvi 660 GPS Receiver

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Help needed, My Garman 765 has lost it's maps. When I turn it on, it will display the message "Cannot unlock maps". Then when I click on tools, settings, maps, "Map Info" is grayed out. Looked (via pc) at Garmin folder and there is a 'gmapprom.img' file there, along with a .gma and .unl file, among others. What can I do? I have performed the latest "update" as suggested per the Garmin website. Thanks in advance for any help.

Posted by Anonymous on

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Posted on Jan 02, 2017

sharcnet
  • 2130 Answers

SOURCE: nuvi 255W

The gmapprom.img file should be at least 1 GB in size. Please see this link:

http://www.sharc.net/discus/messages/6/250.html?1254844672

- Jim

Posted on Feb 22, 2010

sharcnet
  • 2130 Answers

SOURCE: Garmin Nuvi 205 can't unlock maps

First, check to make sure the map file is there. The file name is gmapprom.img. It's located in the Garmin directory. It should be 1GB in size. To do this you need to connect the Nuvi to a PC with a USB cable.

Next, please tell me what year of map you have on your unit, 2009, 2010, etc.

Them, email me your units internal serial number. Its a 10 digit number (not the number on the outside). The number starts with a "3" and can be found by pressing the tools button, then system and then "about".

Please email me at sharcnet-usa AT sharc DOT NET


- Jim

Posted on Mar 27, 2010

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  2. When you're logged in click on the myMaps tab
  3. There you will see the maps you bought and under them the word "Details" in small blue writing. There may also be a message to say that there's an UPDATE AVAILABLE
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Gps has lost its maps, screen says can't unlock maps


There several reasons you may receive the message Can't Unlock Maps on your nuvi or zumo device.
  • Can you press OK and get to the Where To/View map screen?
  • Did you load maps to the unit using the MapSource or MapInstall program?
  • Did you load maps to an SD data card?

If one of the points above applies to you, please follow the steps below to clear the Can't Unlock Maps message:
  1. Remove SD card from unit, if applicable.
  2. Plug the unit into your computer with a compatible USB cable.
  3. Open MyComputer/Computer icon. (Mac users skip this step.)
  4. Right-Click on the Garmin drive and select Open. (Mac users can locate the Garmin drive mounted on the Desktop.)
  5. Open the Garmin folder.1
  6. Locate a file named gmapsupp.img
  7. Right-Click and delete file named gmapsupp.img
  8. Safely disconnect your unit from your computer to see if the Can't Unlock Maps message is gone.

1. Nuvi 1100/1200/1300/1400/1600/3700 and Zumo 665 users will open the Map folder instead.

*If the gmapsupp.img file does not appear in the Garmin folder, please create an unlock file for device.

Nov 28, 2010 | Garmin Nuvi 265W GPS Receiver

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Unit has lost detailed maps that support routing. Whats wrong? Nuvi cannot be used. Will not go beyond problem screen.


The "No Detailed Maps Found That Support Routing" message may appear on your device for the following reasons:
  • The GPS device is missing it's unlock code
  • The maps on the GPS device have been disabled
To determine the cause of the message, touch 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
  • If you do not get the Can't Unlock Maps message then skip to the instructions for Enabling maps on the GPS device
To retrieve unlock codes you need to have your satnav registered with garmin. If you haven't already registered it connect the satnav to your computer and go to https://my.garmin.com/mygarmin/customers/myGarminHome.faces and click Register your garmin device. Follow the prompts. You'll be asked to create a username and password. Write them down and keep them safe. You'll need them anytime you need to update your maps or solve problems in the future.

Retrieving your unlock codes:
  1. Log into your myGarmin account
  2. Select Manage Maps
  3. Select Details
  4. The unlock code is located under the Installed Maps.
Creating an unlock code file for PC:
  1. Plug your Garmin device into the USB port
  2. Double-Click on My Computer or Computer located on the desktop
  3. Right-Click on the Garmin or nuvi 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 upper-case letters with no spaces
  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 New Text Document file
  19. Disconnect the GPS device from your computer
Creating an unlock code file for Mac:
  1. Open the TextEdit application located in the Applications folder on the Mac HD
  2. Click Format
  3. Select Make Plain Text
  4. Type in the unlock code that you retrieved from your mygarmin account. The unlock code should be in all capital letters and with no dashes.
  5. Click Save As and name the file as gmapprom.unl (Note: Be sure to uncheck the box If no extension is provided, use .txt)
  6. Copy the gmapprom.unl file to the GARMIN folder on your device. (Note: Save the file directly to the Garmin mass-storage device if connected)
If you have a second maps you may also need to unlock it e.g. if the first map is USA and second is EUROPE this may also need to be unlocked
  1. Plug your Garmin device into the USB port
  2. Double-Click on My Computer or Computer located on the desktop
  3. Right-Click on the Garmin or nuvi 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 European unlock code that is listed in the Manage Maps section of your myGarmin account. This will need to be typed in all upper-case letters with no spaces
  12. Select File
  13. Select Save As
  14. Change the Save As Type to All Files
  15. Type gmapprom1.unl in all lower-case letters for the File name
  16. Select Save
  17. Close the Notepad window
  18. Delete the New Text Document file
  19. Disconnect the GPS device from your computer
Enabling maps on the GPS device:
  1. Touch the wrench icon on the Where to/View map screen
  2. Touch Settings
  3. Touch Map
  4. Touch Map Info
  5. Select the checkbox next to the maps to be enabled on the device

Aug 15, 2010 | Garmin nuvi 255W GPS Receiver

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I have a Garmin Nuvi 250, when I start the unit it displays "no detailed maps found that support routing". I have checked the drive and it has over 1.3 Gb used. I used the unit last weekend but it doesn't...


The "No Detailed Maps Found That Support Routing" message may appear on your device for the following reasons:
  • The GPS device is missing it's unlock code
  • The maps on the GPS device have been disabled
To determine the cause of the message, touch 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
  • If you do not get the Can't Unlock Maps message then skip to the instructions for Enabling maps on the GPS device
To retrieve unlock codes you need to have registered your satnav. If you haven't already done so connect your satnav to the computer. Go to https://my.garmin.com/mygarmin/customers/myGarminHome.faces and click Register your Garmin product. Follow the prompts. You'll have to create a username and password. Write them down and keep them safe as you'll need them again anytime you need to update your maps.

Retrieving your unlock codes:
  1. Log into your myGarmin account
  2. Select Manage Maps
  3. Select Details
  4. The unlock code is located under the Installed Maps.
Creating an unlock code file for PC:
  1. Plug your Garmin device into the USB port
  2. Double-Click on My Computer or Computer located on the desktop
  3. Right-Click on the Garmin or nuvi 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 upper-case letters with no spaces
  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 New Text Document file
  19. Disconnect the GPS device from your computer
Creating an unlock code file for Mac:
  1. Open the TextEdit application located in the Applications folder on the Mac HD
  2. Click Format
  3. Select Make Plain Text
  4. Type in the unlock code that you retrieved from your mygarmin account. The unlock code should be in all capital letters and with no dashes.
  5. Click Save As and name the file as gmapprom.unl (Note: Be sure to uncheck the box If no extension is provided, use .txt)
  6. Copy the gmapprom.unl file to the GARMIN folder on your device. (Note: Save the file directly to the Garmin mass-storage device if connected)
  1. Plug your Garmin device into the USB port
  2. Double-Click on My Computer or Computer located on the desktop
  3. Right-Click on the Garmin or nuvi 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 European unlock code that is listed in the Manage Maps section of your myGarmin account. This will need to be typed in all upper-case letters with no spaces
  12. Select File
  13. Select Save As
  14. Change the Save As Type to All Files
  15. Type gmapprom1.unl in all lower-case letters for the File name
  16. Select Save
  17. Close the Notepad window
  18. Delete the New Text Document file
  19. Disconnect the GPS device from your computer
Enabling maps on the GPS device:
  1. Touch the wrench icon on the Where to/View map screen
  2. Touch Settings
  3. Touch Map
  4. Touch Map Info
  5. Select the checkbox next to the maps to be enabled on the device

Aug 09, 2010 | Garmin nuvi 250W GPS Receiver

1 Answer

Just updated the software with webupdate for windows_242 from garmin website succesfully. ''No detailed maps found that support routing. The street pilot cannot be used without them. comes up when...


The "No Detailed Maps Found That Support Routing" message may appear on your device for the following reasons:
  • The GPS device is missing it's unlock code
  • The maps on the GPS device have been disabled
To determine the cause of the message, touch 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
  • If you do not get the Can't Unlock Maps message then skip to the instructions for Enabling maps on the GPS device
Retrieving your unlock codes:
  1. Log into your myGarmin account
  2. Select Manage Maps
  3. Select Details
  4. The unlock code is located under the Installed Maps.
Creating an unlock code file for PC:
  1. Plug your Garmin device into the USB port
  2. Double-Click on My Computer or Computer located on the desktop
  3. Right-Click on the Garmin or nuvi 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 upper-case letters with no spaces
  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 New Text Document file
  19. Disconnect the GPS device from your computer
To check that the map has not been disabled. Press Tools, then press Settings, then press Map, then press Map Info and see if your map has a tick to show it's selected. If not press the map name to select it. It should then work.

Jul 27, 2010 | Garmin GPS

2 Answers

When i typre in a location etc it says no match


go to setting. then gho to maps. then to map info and tick in thge box aghainst city navigation nt 2008. found under best solution tanjeev on ur site. thanks. works like new again.

Sep 03, 2009 | Garmin nuvi 350 GPS Receiver

2 Answers

"Cannot unlock maps" when GPS is disconnected.


Hi,

Go to your account at garmin that you created to manage your maps.

Click myMaps

Click Manage Maps

You should see your unit and it’s unlock codes

Copy all the unlock codes for your device

Close your internet browser
Right click on your desktop

Click new, and then click a new Text Document

Click on the newly created Text Document icon from the desktop

Type your unlock codes into the document
Click File and Save as

Change the file name to gmapprom.unl (( double check this please ))

Change the “Save as type” to "All files"
Close the document

You should see the file gmapprom.unl on your desktop
Right click on the gmapprom.unl file and then click copy

Plug your Garmin device in and then click Computer/ My Computer
Click on the nüvi drive

Right click on the Garmin folder and click paste
Safely disconnect your Garmin device from the computer


All the best
Regards
Richard.

Apr 19, 2009 | Garmin nuvi 205W GPS Receiver

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