I have a Z110bt that has the 2012 maps/firmware update, which I am told updates my NAVI to a 940. I live in SoCal, and traffic is of course a concern of mine. Is the ND-TMC10 traffic sensor a worthwhile addition? What, exactly, will it do for me? Will my NAVI automatically route me via the fastest route? What is involved in the installation of this tuner? How much is a reasonable charge I should expect to pay, if I buy it and choose to have someone else do it?