dumb compass

noun Navigation.
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[puh-lawr-uhs, -lohr-]
noun, plural peloruses. Navigation.
a device for measuring in degrees the relative bearings of observed objects.
Also called dumb compass.

1850–55; perhaps < Latin Pelōrus, now Faro in Sicily, a cape which requires skill in navigation

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World English Dictionary
pelorus (pɪˈlɔːrəs)
n , pl -ruses
a sighting device used in conjunction with a magnetic compass or a gyrocompass for measuring the relative bearings of observed points
[of uncertain origin, perhaps from Latin Pelōrus a dangerous Sicilian promontory]

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