Over 20 years ago CASA required the 206 marine pilot transfer at Port Hedland to have a second pilot or a SAS fitted for the 20 mile point but not the 10 mile one. The company decided the SAS was the cheaper option. I found the nights there the blackest I had experienced but after a few nights, it's surprising how easy it became. We also had to have a large moveable light fitted, I think it came from a 212. New pilots without much night experience found it very hard & some never made the grade, so the CASA requirement was popular.