Not far out in marine navigation (7)

I believe the answer is:

inshore

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'not far out' is the definition.
(I've seen this before)

'in marine navigation' is the wordplay.
'marine navigation' becomes 'shore' (I am not sure about this - if you are sure you should believe this answer much more).
'in'+'shore'='INSHORE'

Can you help me to learn more?

(Other definitions for inshore that I've seen before include "towards the coast from the sea" , "Close to the land" , "coming in to land" , "close to beach" , "not far from the coast" .)

I've seen this clue in The Globe and Mail.

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