long range/High level nav? what punch the FP into a computer and press enter?
Hardly; there's a fair bit more to it than that.
An air engineer would need a significantly longer PET course than a navigator from any background.
Other air forces who thought that an 'Operator' would be sufficient in 21st century tanker aircraft soon realised that they were wrong. Whereas their ex-FJ or ex-C130 navigators were ideal MSOs.