The slidey-uppy-downy bit is ace for getting ice off the car windscreen though!
I honestly cannot understand why the CAA still insists on people using the wretched things at PPL level - electronic versions have been around for years and are dead easy to use. But there are still people at the Belgrano who think that you're not a real navigator unless you can use an astrolabe, quadrant staff and lodestone on a piece of string......
The triangle of velocities is hardly a difficult concept to master without using a whizz-wheel.
eharding, I hope that the eight-legs have enjoyed playing with your piece of CRP!