We are preparing for a European trip next year.
It will be a Spain/Portugal road trip.

I want to be able to add a CN Europe map set to the GPS for the trip, going back to the USA maps on our return home.

Assuming the new GPS will work similar to the NUVI, I will probably need to erase the U.S. maps and install the European maps for the trip.

I assume I need to install the NTU rather than the NT maps?

Can both map sets be installed on the Drive 61 LM US at once, or will one need to be erased to install the other?

Any other caveats for an old NUVI user concerning the Drive 61 LM US?