Analyzing GarminDevice.xml from Nuvi 3490 I discovered some interesting things.
Some new features like InstaSearch, AddressSearch, FastRouting, which are related to SID:
</DataType>
- <DataType>
<Name>InstaSearch</Name>
- <File>
- <Specification>
<Identifier>INSTASEARCH</Identifier>
</Specification>
- <Location>
<Path>.System/SID</Path>
<FileExtension>sid</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
- <DataType>
<Name>AddressSearch</Name>
- <File>
- <Specification>
<Identifier>ASG</Identifier>
</Specification>
- <Location>
<Path>.System/SID</Path>
<FileExtension>sid</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
- <DataType>
<Name>FastRouting</Name>
- <File>
- <Specification>
<Identifier>PPD</Identifier>
</Specification>
- <Location>
<Path>.System/SID</Path>
<FileExtension>sid</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
-----------
But what is different from other devices is:

- <DataType>
<Name>trafficTrendsv3</Name>
- <File>
- <Specification>
<Identifier>HTF</Identifier>
</Specification>
- <Location>
<Path>.System/SID</Path>
<FileExtension>sid</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
- <DataType>
<Name>CountryStateSearch</Name>
- <File>
- <Specification>
<Identifier>CBX</Identifier>
</Specification>
- <Location>
<Path>.System/SQLite</Path>
<FileExtension>db</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
-----------------------------------
Looks like Traffic Trends now are not related to sqlite like it was in other units:

- <DataType>
<Name>trafficTrends</Name>
- <File>
- <Specification>
<Identifier>HTF</Identifier>
</Specification>
- <Location>
<Path>.System/SQLite</Path>
<FileExtension>db</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
-------------------
Also SQlite is now "CountryStateSearch":

- <DataType>
<Name>CountryStateSearch</Name>
- <File>
- <Specification>
<Identifier>CBX</Identifier>
</Specification>
- <Location>
<Path>.System/SQLite</Path>
<FileExtension>db</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>
---------------------------------------
In SQlite folder I have to files: D317400.db and D3413020A.db.
File D317400.db is a well known Traffic Trends file.
So D3413020A.db must be related to CountryStateSearch.
When I remove D317400.db then my Nuvi doesn't show TrafficTrends text at the CNE map.
When this file remains, I have Traffic Trends v4.25.
But then what means this:
- <DataType>
<Name>trafficTrendsv3</Name>
- <File>
- <Specification>
<Identifier>HTF</Identifier>
</Specification>
- <Location>
<Path>.System/SID</Path>
<FileExtension>sid</FileExtension>
</Location>
<TransferDirection>InputOutput</TransferDirection>
</File>
</DataType>