Driver's aid (6)

I think it could be either:

Which length description are you looking for?:

3,3

satnav

'driver's aid' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for satnav that I've seen before include "Driver's route finder" , "course-finding apparatus" , "Electronic direction finder" , "Route guide" , "Driver's guide" .)

I've seen this clue in The Times.

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