Question about Garmin StreetPilot C330 GPS Receiver

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SC card Using MapSource, I selected a map and downloaded it to my GPS with an SD card inserted. All on-screen information, both my computer & GPS indicate that the map set was built & transferred successfully. However, I have no idea how to "select" or access the map I just downloaded to the SD card. When I insert the SD card in a card reader, the downloaded file has been downloaded as: GARMIN/gmapsupp.img Garmin support is of NO help whatsoever. Any 'expert' help would be greatly appreciated. Thanks

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Re: SC card

I am not able to look at the map, as it always direct me back to my home. How can I solve the problem ?

Posted on Sep 13, 2007

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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

1 Answer

Lost maps

You do not give very much information to go on.
Perhaps you have downloaded some data such as routing or some other details from your computer via "MapSource". If so AND you have a mini SD card in the GPS, you have overwritten the SD card with the data from MapSource ...the map data on the SD card is now gone!
But the MapSource Data remains.
If you have copied the original data on the SD card, just copy and paste to re-place it.
If NOT you will need to contact Garmin to get a new SD data card.

What you have to do to prevent this in the future is to temporarily remove the Data Card from the Garmin GPS, then download the MapSource data from your computer. Then the MapSource Data goes to the GPS on-board memory.

Jul 21, 2010 | Garmin GPS Devices

1 Answer

POS Garmin Streetpilot C330.... HELP REQUESTED!

I think this one is a return to seller or send to Garmin.

Jul 05, 2009 | Garmin StreetPilot C330 GPS Receiver

1 Answer

I tranfert bluechart from my PC using mapsource to

I recommend upgrading your system software to the latest version (5.30),
follow this link for directions and the file's location.

  1. Click on "Download" and choose to save the file to your computer.
  2. Choose a location where you can easily find the file, such as the 'My Documents' folder or 'C:\'.
  3. Once the download is complete, go to the location where you saved the file.
  4. Double-click on the downloaded file. This will automatically extract the files to C:\Garmin and run a program to transfer the software update to an SD card.
  5. Load the SD card into your GPSMAP 545s and turn it on to replace the system software of your unit.
I hope that helps.

Jul 04, 2009 | Garmin GPSMAP 545s GPS Receiver

1 Answer

Can't unlock maps on the SD card

I am still waiting for the promised free solution suggestions

Jun 12, 2009 | Garmin nuvi 350 GPS Receiver

1 Answer

Garmin zumo 550 map update problem

  1. Make a backup of your Zumo by copying all the file to your computer.
  2. Using your PC and MapSource select all the maps then send them to a SD memory card need 2Gig or bigger card.
  3. Try to rename this file to gmapprom.img and replace the same named file in your zumo. (I haven't tried this personally, so if it fails, just replace this with your backup and all will be as it was.)
  4. If this fails, you can use the SD memory card in your zumo and it will use this map instead, but it will take longer to boot your zumo.

Jan 09, 2009 | Garmin zumo 550 GPS Receiver

1 Answer

Vista HCX Micro SD Problem

Vista only recognize gmapsupp.img files.Go to take MapUpload software then from mapsource select maps you want to transfer to sd card.Or directly from Mapsource select Transfer and send selected map to sd card.Maps must be unlocked.

Aug 19, 2008 | Garmin eTrex Vista GPS Receiver

1 Answer

New Maps - Can't update unit

The new maps will be unlocked to your GPS using the code Garmin supplied you.

You will have to add these maps to a second SD card if your present card is full, or else purchase a larger card. Since all the Mapsource NT 2008 Europe maps are 1,395MB in size, you'll need to purchase at least a 2GB SD card.

Mar 27, 2008 | Garmin StreetPilot c510 Deluxe GPS...

2 Answers

Downloading map to 276C

I think your problem, as it was my also, is the memory card. I tried with a friend of mine's data card (memory) and is working fine, I sent my card to garming after I talk to them over the phone for an exchange. I have a 276C with 512Mb data card. I hope this help you to solve it. Javier Martinez Valencia-Venezuela

Sep 10, 2007 | Garmin GPSMAP 276C GPS Receiver

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