City Navigator North America NT 2025.10 FID 12328

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Try using gimgunlock on the map you downloaded.

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In the garmindevice.xml from an AM from Europe I have I don't see any mention of supplemental maps (gmapsupp.img) check to see the path & name in your garmindevice.xml
Garmin say 8Gb maximum SD card size so check that.

<PartNumber>006-J0183-1K</PartNumber>
<SoftwareVersion>610</SoftwareVersion>
<Description>CTP16</Description>

</Model>

<Id>3987654321</Id>
<MassStorageMode>

<DataType>
<Name>BaseMaps</Name>
<File>
<Specification>
<Identifier>IMG</Identifier>

</Specification>

<Location>
<Path>Garmin</Path>
<BaseName>gmapbmap</BaseName>
<FileExtension>img</FileExtension>

</Location>

<TransferDirection>InputOutput</TransferDirection>

</File>


</DataType>

<DataType>
<Name>PreProgrammedMaps</Name>
<File>
<Specification>
<Identifier>IMG</Identifier>

</Specification>

<Location>
<Path>Garmin</Path>
<BaseName>gmapprom</BaseName>
<FileExtension>img</FileExtension>
<Extensions>
<dtlxataTypeLocationExtension>
<dtlx:ExternalPath>Garmin//</dtlx:ExternalPath>

</dtlxataTypeLocationExtension>


</Extensions>


</Location>

<TransferDirection>InputOutput</TransferDirection>

</File>


</DataType>

<DataType>
<Name>TimeZoneMaps</Name>
<File>
<Specification>
<Identifier>IMG</Identifier>

</Specification>

<Location>
<Path>Garmin</Path>
<BaseName>gmaptz</BaseName>
<FileExtension>img</FileExtension>

</Location>

<TransferDirection>InputOutput</TransferDirection>

</File>


</DataType>

<DataType>
<Name>PreProgrammed3DMaps</Name>
<File>
<Specification>
<Identifier>IMG</Identifier>

</Specification>

<Location>
<Path>Garmin</Path>
<BaseName>gmap3d</BaseName>
<FileExtension>img</FileExtension>

</Location>

<TransferDirection>InputOutput</TransferDirection>

</File>


</DataType>

<DataType>
<Name>PreProgrammedDEMMaps</Name>
<File>
<Specification>
<Identifier>IMG</Identifier>

</Specification>

<Location>
<Path>Garmin</Path>
<BaseName>gmapdem</BaseName>
<FileExtension>img</FileExtension>

</Location>

<TransferDirection>InputOutput</TransferDirection>

</File>


</DataType>

<DataType>
<Name>PreProgrammedLaneAssistPortraitFull</Name>
<File>
<Specification>
<Identifier>JCV</Identifier>

</Specification>

<Location>
<Path>Garmin/JCV</Path>
<FileExtension>jcv</FileExtension>
<Extensions>
<dtlxataTypeLocationExtension>
<dtlx:ExternalPath>Garmin/JCV/</dtlx:ExternalPath>

</dtlxataTypeLocationExtension>


</Extensions>