I found a way to simulate a GPX track but I was wondering if there is no easy way to do it.
Menu -> Dashboard -> Route simulation -> Start simulation -> Route simulation with a GPX track -> OK.
Choose a track.
Now is seems de program stops.
Click on the symbol for navigation.
To the question 'use GPX track for navigation "answers" Yes ".
Now return to Dashboard -> Route simulation -> Start simulation and now choose "Route simulation of the calculated route". Click OK.