I wholeheartedly agree with @bishop8950 about the need for improved education of all officials regarding boat paths. It should be specifically discussed at clinics and seminars to demonstrate what a small movement is, what a big movement is, what a deliberate movement is.....
It sounds obvious but in reality it takes knowledge, practice and experience.
And we already have technology available that can solve this nonsense overnight.
For $200 on a video capture device and free software the appointed end-course monitoring official can click a few buttons on SplashEyeDrive and have a complete deviation report 10 seconds after the pass.
For $2000 on a GPS system the driver/judge can have tracking live in the boat.
These solutions allow us to deal with the problem at the time. Give the skiers the reride they often deserve, give the Chief Judge/Driver the data they need to properly manage the driving and improve the drivers performance through accurate, immediate and objective feedback.