@java777
I guess you mean extra additional features other than those like standard features such as using JCV files, or those like LA & SLI which are embedded in the CNNTEUU map?
If so, maybe it's a tad OT here (but who am i to criticize)

If you want to just check what features your 3760 already supports, either look at your GarminDevice.xml (found in the Garmin folder of your device, and in it you can also confirm the correct paths for the relevant files too), or check on Garmin site for the specifications of 3760, here:
Code:
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If you want to enable even more additional features, Read these threads: [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]. Also go to [Only registered and activated users can see links. ] to see how the features are used and where the files go. Post in the other threads if you need help.