Could you ensure that anyone simulating the Nav radar role spends a good portion of their session bent over the rear view periscope (in a 2 hour tanker-tanker training slot that's a lot of bending.) Oh and of course they will have the parachute harness fully done up to increase the discomfort level.
Not to mention the Nav Rad's sore neck after spending 3 hrs out of a 4 hr transit snoozing!
