Creampuff
Yeah, old Navy Commander mate of mine now well retired as part of his skill-set requirement acquired a "navigators" ticket which i understand allowed him to navigate any navy ship into any port in the world unassisted by tugs.
Some years ago tried to get a SPL on the road to becoming a PPL.
Was defined as a "potential hazard to aviation" due to failing the Ishihara.
Dilemma, ships in close quarters are largely navigated by coloured lights, so how come he continued to pass the very rigorous Navy system and operated safely for many years without incident.
He was smart enough not to test CASA confidentiality by protesting with the Navy evidence.
Go figure.