MEASURING DISTANCES, LEVELS OR BEARINGS

**Definition:** This place covers:

Devices, systems and methods for measuring distances, levels or bearings, for surveying, for photogrammety or videogrammetry, for navigation; Gyroscopes and other turn-sensitive devices used as sensors. The subclass coverage includes:

**Limiting references (this place does not cover):** - Measuring liquid level -> G01F - analogous arrangements using other waves -> G01S

**Glossary:** - Navigation: means determining the position and course of humans, land vehicles, ships, aircraft, and space vehicles - Propagation effects: are relevant if the outcome of a measurement depends on the actual value of a physical quantity characterising the propagation of the wave, i.e. its wavelength, frequency, velocity, or phase. The mere presence or direction of a wave are not considered a propagation effect or to contribute to a propagation effect. To put it in another way, propagation effects are irrelevant, if the radiation may be looked upon as a beam of radiation whose wave nature can be ignored. Examples of measurements where propagation effects are relevant include e.g. measurements of propagation time, phase difference, phase delay, measurements using the Doppler effect, or interference.