Completely enclose a navigational aid (7)

I believe the answer is:

compass

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This might be a double definition.

'completely enclose' is the first definition.
'compass' can be an answer for 'enclose' (thesaurus). I'm not sure about the 'completely' bit.

'a navigational aid' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for compass that I've seen before include "Range, scope" , "may be boxed" , "Course guide" , "where all points considered?" , "using R [ROSE] for direction" .)

I've seen this clue in The Irish News.

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