Meresõidus on peilimismõõturiks sobivalt paigaldatud tuulelipuga varustatud juhtelemendita pöörlev kompass, mis võimaldab jälgida suhtelisi liikumise suundi.
Pelorus is in marine navigation a "dumb compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings.
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