CPC Subgroup
G01C 17/04 with north-seeking magnetic elements, e.g. needles
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
4 direct subcodes
Child Classifications
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- G01C 17/06 Suspending magnetic elements
- G01C 17/10 Comparing observed direction with north indication
- G01C 17/18 Supporting or suspending compasses, e.g. by gimbal, by flotation
- G01C 17/20 Observing the compass card or needle