Use a real example go a navlog.
Use the opportunity to make an exercise in preparation of a navigation.
Show a partly filled in nav log and let the students prepare the remainder.
Use color pictures of chart preparation instead of just drawing on the whiteboard.
Talk of cockpit management.
In other words approach the practical side of air navigation. (what pens to use, how to read the map and the landscape, what features to use and which not, how to keep the nav log, explain what the pitfalls are during navigation, stress the scanning while navigation in moments of higher workload...