Of ships and navigation (8)

I believe the answer is:
nautical
'of ships and navigation' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for nautical that I've seen before include "To do with ships and the sea" , "Of ships and navigation" , "Like 8 21[HORATIO NELSON]" , "about boats" , "like a sailor" .)