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Garmin Nuvi 300. Map on SD card - can't unlock

Dear Sirs,

I have a Garmin Nuvi 300 purchased in Ireland.  The Nuvi came with maps for Ireland and England pre-installed.

Am now in South Africa and purchased SA map on SD card.  Now I have gathered from my reading on the Internet that these cards should be "Plug and Play" with no installation or unlocking requred but with the card inserted in the slot I get a message that the Nuvi can't unlock the maps.

I do not want to remove the internally installed map of Ireland and UK as I shall be there again next year.

Can you help please?

I should mention that the pre-installed maps are internal i.e. there was no SD card in the external slot when I bought the unit.

Would be very grateful for help/advice.

Thank you.




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6 Suggested Answers

  • 24 Answers

SOURCE: Tomtom one cant unlock maps

well,then there is only one way, that definetly works, ttsystem patcher, if tomtom company doesn;t want to help, we can do it our self ;)
there are lots of warez about ir ;) in ;)

Posted on Mar 01, 2009

  • 1 Answer

SOURCE: Nuvi 200w map download and sd card

Guys and or ladies... I know that you have to create a folder named "GARMIN" in the sd card so the maps can be recognize. Maybe this solves your problem. Let me know if it works.
BR from Spain,

Posted on Apr 01, 2009

  • 1 Answer

SOURCE: Can't unlock maps on the SD card

I am still waiting for the promised free solution suggestions

Posted on Jun 13, 2009

  • 4090 Answers

SOURCE: Maps on SD card not recognized by Garmin C330 GPS

I dont thinki the 330 handles 4Gb SD cards I think 2Gb is the maximum that is why it isd taking so long and runds out of space so cannot properly load the maps.

Posted on Jul 22, 2009

  • 13 Answers


Posted on Jul 31, 2009

  • 1 Answer

SOURCE: Garmin C510 wont install download Europe maps to Unit

Take a look at the Garmin support page - there is a Question " Why do I get a not enough space message on my Nuvi2xx when trying to update my mapping?"
It tells you how to remove the unused voice files to free up space.
I have a Nuvi 255WT and deleting the voice files alone was not enough, so I set about removing a lot of other stuff *** NOTE THAT IF YOU FOLLOW WHAT I DID, DO IT AT YOUR OWN RISK **** it worked for me but there is always the risk of deleting a file that the device needs.
Also I was stupid and didn't try and save the files to a directory on my MAC before deleting them, from the satnav - worth a try so that if you can do that you have a chance of recovering one that you delete if you want it back.
First I also removed the un-needed text files - leaving only the 3 British-English files
Then I removed all of the POI files that were clearly examples/samples
Then I removed all of the Vehicle files except the one I was using
Then I removed all of the large ExtData files - now that was the one that caused me the most worry as I wasn't certain what they were there for!
This gave me a bit over 140Mbyte of free space which was enough to install the 2010 update for all of Europe.
Now I don't know whether the C510 has the same amount/less/more memory than the 255WT - so this may or may not work for you.
I didn't have an SD card available, which is why I went this far. I am going to get one and see if I can find out how to load the maps onto that.
cheers - Jeremy

Posted on Dec 01, 2009

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Need to know how i update the maps card for it

The latest version of Garmin Express provides the ability to install a map update directly to an SD card.
The SD card installation option will only appear when updating a compatible device that does not have sufficient internal memory for the largest allowable map region. When using the SD card installation option, critical files are loaded to the SD card so it must remain in the device after the update to ensure full functionality. For the largest size SD card a device can use, refer to: What is the largest size Secure Digital (SD) card that an automotive device can accept?
The SD card support during the map update will only function with up-to-date software. It may be necessary to update the device's software with Garmin Express prior to updating the maps. These devices do not support the SD card option:
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For devices that do not support using the SD card with the map update application, any maps that do not fit in the internal memory can be installed to the SD card manually, using these instructions:

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I believe your current location is somewhere in UK/Ireland, which means the Nuvi's last/current satellite fix is not anywhere within Spain/Portugal. If you need to use the maps features of that country where you're not physically there with the Nuvi, the Nuvi must be in Simulation mode first. Fold down the antenna to switch off GPS (not device) and enter Simulation mode.

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