If you have read post n1 and 2, you should know that ONLY nuvi 40/50 version JCV works in Street Pilot, so you have to use NTU map and NTU 3d map&JCV -
Addition files are version dependent, so NTU 2014.20 and NTU gmap3d 2014.20+ NTU nuvi 40/50 2014.20 or CNE NTU files from newer versions.
The problem is SP reads only Nuvi40/50 JCV and Nuvi 40/50 receives for EU only NTU map from Mapupdater, so JCV for NT map doesn't exist.