Problems with map
This leaves you in the tomtom and do not know why
If you have loaded a map of the forum and you get that image can be for four reasons (usually):
Picture500

1º-The NavCore this unpatched.
2º-The map is unchecked.
3º-The map is not compatible with the NavCore.
4º-The map is corrupted.

To fix point 1 NavCore unpatched:
patching NavCore
[Only registered and activated users can see links. ]

Or place a NavCore of the forum they are patched (better consultation)
[Only registered and activated users can see links. ]

To address point 2 map unchecked:
Activation maps for Tonton
[Only registered and activated users can see links. ]

To see if the map is compatible with NavCore in Section 3 reviews the list of maps will be in the post map or question in the forum.
[Only registered and activated users can see links. ]

If this did not work obviously the map is rather bad for download or decompression.
Solution download it again or download other compatible version.