I have problems sending locations from new Google Maps to the nuvi also. But I think that the reason lies in the way the new Google Maps shares locations. If you try to share some location with SMS, for instance, the result is text with the name of the location and a google link, which contains some GPS coordinates, but how actual and accurate are they... I don't know. The other problem is that if you try to send location that has not a valid address and it is somewhere in the wild, the shared text contain something like "Dropped pin...." followed by "null" where the google link with the corresponding coordinates should be. So, I think that Google Maps shares "nothing" for the time being.