basti wrote on Aug 31^st, 2019 at 10:09pm:

Ok thanks. And let's say I want to fly a direct to a waypoint some pages ahead, how can I do this?

You can't. Even though the Captain Sim INS has the unrealistic ability to load, and change pages when there are more than 10 waypoints, in reality, the real CIV-A INS could never have more than the 10 waypoints entered, and as waypoints were past you manually entered the new waypoints needed to continue the route.
i.e. When flying leg 7-8 of the route, you then manually entered the new waypoints in waypoint numbers 1 through 6, so that when the INS started the  9-1 leg, waypoint 1 would ahead, not behind, in the route.
If you have ever used the SimuFly CIV-A INS, you would probably already know, and understand, this functionality better. ;)