IPC Subgroup
G01C 17/1 Comparing observed direction with north indication
Introduced: September 1968
Last revised: January 2006
Full Title
Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes > Magnetic compasses > with north-seeking magnetic elements, e.g. needles > Comparing observed direction with north indication
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
3 direct subcodes
Child Classifications
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- G01C 17/12 by sighting means, e.g. for surveyors' compasses
- G01C 17/14 by reference marks, e.g. for ships' compasses
- G01C 17/16 by clinometers, e.g. for determining dip or strike of geological strata