tempo maps between Pro Tools 10 and Nuendo 6

I recently purchased AATranslator to convert files between Protools and Nuendo. The program does not cover tempo maps.

Is there a way to translate that function between the two programs? I don’t mean a single tempo but rather actual tempo changes to the song.

You can use a simple midi-file:
Export midi in PT, import that midi in N.
Midi includes tempo-information.

Can I do the same from Nuendo to Protools and will this function include the marker track as well?

You can do it either way