I managed to do it a different way.
Im Mapsource selected overlapping tiles from streetmap and trails map.
Transfer to 3490 device /memory card/Garmin/Gmapsupp.img
Use Gmaptool to change MS Flag to 0.
Run Basecamp, plug in GPS and both Map and Trails Displayed in BaseCamp.
[Only registered and activated users can see links. ]
I retained Routing Capabilities and Adress Search in both GPS and Basecamp.
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