The waypoint is just a blob on the magenta line.
I suppose if that's the mentality you choose to take in navigation, then it's probably good enough for you.
It's definitely not good enough for me.
I too had to land mid Saudi in a ferry jet I was bringing back. 2000 metres dust! on landing the wind increased dramatically the palm trees bent double and visibility dropped to 100 metres in a sand storm.
When I lived and worked in Saudi Arabia, I had more approaches to minimums than I'd had in a very long time. Sand, and weather. Lots of good weather, too, but surprisingly one does do a lot of instrument work there (or at least, we did).
Cant open your link but presume its some tragic event of a pilot using a home made approach?
I read through it; it's a very thorough mishap report involving a helicopter operation in Ireland. The crew was using a locally-developed approach by GPS, and failed to turn at a waypoint onto the final approach course. They overflew the course and impacted terrain. The pilot flying had no idea where he was before they started, and indicated as much, asking the pilot not flying to handle the navigation and keep them honest. They were IMC for most of the flight, at night.
Setting aside legalities, it wasn't the home-made nature of the approach that did them in, but failure to follow the guidance that they had. The same could be said equally of flying a published procedure; if one flies off the procedure and doesn't stay on track, one can certainly impact terrain as the crew on that helicopter did.