No navigation jobs outside in the sense that MP>CP MN>anything they can turn their hand too.
A pilot is a pilot and flies whereas in civvie street a navigator has a good chance of getting an aviation specialist job but a very slim chance of actually flying. Training as a civilian pilot would be the only way.
Before you opt for nav you want to find out 'the future of the navigator role in the RAAF' In the RAF this question was asked in 1989 by the man from the Ministry. All at the meeting looked aghast as it was presumed that that was his job!
What do RAAF navigators do? P3, F111 and ...?