TREA

Compasses Devices for ascertaining true or magnetic north for navigation or surveying purposes

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Industry

  • CPC
  • G01C17/00
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Parent Industries

GPHYSICS G01Measuring instruments G01CMEASURING DISTANCES, LEVELS OR BEARINGS SURVEYING NAVIGATION GYROSCOPIC INSTRUMENTS PHOTOGRAMMETRY OR VIDEOGRAMMETRY

Current Industry

G01C17/00Compasses Devices for ascertaining true or magnetic north for navigation or surveying purposes

Sub Industries

G01C17/02Magnetic compasses G01C17/04with north-seeking magnetic elements G01C17/06Suspending magnetic elements G01C17/08by flotation G01C17/10Comparing observed direction with north indication G01C17/12by sighting means G01C17/14by reference marks G01C17/16by clinometers G01C17/18Supporting or suspending compasses G01C17/20Observing the compass card or needle G01C17/22by projection G01C17/24Illumination G01C17/26using electric pick-offs for transmission to final indicator G01C17/28Electromagnetic compasses G01C17/30Earth-inductor compasses G01C17/32Electron compasses G01C17/34Sun- and astro-compasses G01C17/36Repeaters for remote indication of readings of a master compass G01C17/38Testing, calibrating, or compensating of compasses
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