WordReference Random House Unabridged Dictionary of American English © 2020
mariner's com′pass, 
  1. a compass used for navigational purposes, consisting of a pivoted compass card in a gimbal-mounted, nonferrous metal bowl.
  2. Astronomy(cap.) compass (def. 8a).
  • 1620–30

'mariner's compass' also found in these entries (note: many are not synonyms or translations):
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