Comparing observed direction with north indication

Full Title

Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes (using gyroscopic effect G01C19/00) > Magnetic compasses > with north-seeking magnetic elements, e.g. needles > Comparing observed direction with north indication

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