How to extract POIs from ".gmp file from City Navigator Europe NT 2013.30.gmap

Bodenmann · 7th December 2012, 07:48 PM

Hi together
I have bought City Navigator Europe NT 2013.30.gmap from Garmin. How can I extract the files from the *.gmp data, especially the poi's?
Many thanks for your help!
Peter

**Roger** · 7th December 2012, 09:16 PM

Welcome on Noeman Forum

I do not think you can do to pull POIs on the map from the map itself.

Even if one could ... on which of the 477 (NT and NTU) that make up the same map?

Example:first folder 00417038 with files I10FD95C.GMP

Example Data file from NT(U):

Code:

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Bye,bye

Bodenmann · 7th December 2012, 09:27 PM

Thanks for your answer. I have also downloaded POIs from OSM. But they are not as well structured as the ones from a navi. Is there any other possibility to get POIs (TOMTOM and so on) that I can use in qGIS or ArcGIS?
Peter

**Roger** · 7th December 2012, 09:43 PM

Ah,ok....your correct section is [Only registered and activated users can see links. ]
In the correct section you can find some more help

For Quantum GIS [Only registered and activated users can see links. ]

For ArcGIS [Only registered and activated users can see links. ] (but link dead...sorry)

Bye,bye

**Giomen** · 7th December 2012, 11:29 PM

Originally Posted by Bodenmann

I have bought City Navigator Europe NT 2013.30.gmap from Garmin. How can I extract the files from the *.gmp data, especially the poi's?

No way for Garmin now! Cause is in the letters "NT". There are not editors or decompiler for this Garmin format.

novoment · 15th February 2013, 10:11 AM

The only way to do that is to do some reverse engineering on the only two (as far I know) programs that can read Nt format: Garmin Mobile XT and Mapsource (and its derivatives: training center and so on)...so, we need some magic here

Several days ago I have read in another blog that the nt format is just scrambled by a simply xor function, that is because it cannot be decrypted, yet?

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**kunix** · 15th February 2013, 10:42 AM

Originally Posted by novoment

Several days ago I have read in another blog that the nt format is just scrambled by a simply xor function, that is because it cannot be decrypted, yet?

If it were that simple, everyone would already be able to do that. But no, NT is somewhat more complicated. Speaking in general terms, older IMG sections are packed inside the new GMP section, and a few new datatypes are added to the older sections.
Also a few people have definitely reverse engineered it, but they don't release the results of their efforts. And I can't blame them for that

And also the tiny bits of info above is not my personal research, I'm just retelling the words of one man "in the know".

**Giomen** · 15th February 2013, 09:59 PM

Originally Posted by novoment

Several days ago I have read in another blog that the nt format is just scrambled by a simply xor function, that is because it cannot be decrypted, yet?

Read this blog and you know that a some resource is packed for smaller size of data. I do not hear about xor function for packing...

**ddabcd277** · 15th February 2013, 11:49 AM

Think the most important question here is why would one need that? In general the weakest part of the Navteq mapping is its POIs. You can find many free sources with better data. Even Garmin in the latest models are hiding purposly the POIs from CNE.