Nuvi 780 + Mac Software?

I have the privilege of trying out the Nuvi 780 before buying, thanks
to visiting relatives.

Using Road Trip for Mac, which works very well with my 60CSx, I want to
upload a route to the Nuvi. The software recognizes and can communicate
with the Nuvi, and it reports successful data transfer. That's the end
of it. The waypoints and route do not appear on the Nuvi.

What gives, please?

TIA!

Davoud

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