Enter a clue or pattern or both:
The Clue
Navigators' instruments (7 letter answer)
The Answer
OCTANTS
Tags
Notes
The answer OCTANTS is so rare that it appears less than once every 2500 puzzles.
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Definition
OCTANT as a noun:
1. a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration