Cryptic crossword clue
Navigation system that when faulty could make marine go north 9

The most common and most likely answer to this crossword clue is the 9 letter word OMNIRANGE

O
M
N
I
R
A
N
G
E

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The straight part
We know that "Navigation system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case navigation system = omnirange.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does OMNIRANGE mean?

OMNIRANGE noun
  1. A short-range radio navigation system for aircraft, based on a network of fixed radio beacons on the ground.

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