Sorry, a couple of qn (must have been asked but i could not get definite answer...)

My Nuvi 765 is USA version, ie came with USA map.

Q1. Does it supports JCV and Lane Assist, 3D files in Europe
Q2. Is it possible to install the europe map onto the main unit memory, together with the JCV files, 3d, assuming it is supported. if can, how - just change the last character to xxxxxxxx1.img?
Q3. Installing all into the main memory slow the unit? Assuming that the only the appropriate map will be selected for use.

Thanks for helping.