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Rho-theta is a term used in aviation navigation for a location method (or even a group of locating methods) based on the measurement of coordinates (direction and distance to a ground station beacon or beacons ). Many automated Aids to Navigation, such as a VORTAC, use the Rho-Theta data as the primary method to calculate relative position of an aircraft to the reference beacon(s). Rho-Theta methodology is a key component in Area Navigation (RNAV).

The term "Rho-Theta" consists of the two Greek letters corresponding to Rho and Theta:

• Rho (Greek ρ) as a synonym for distance measurement, e.g. Rho would be the equivalent to the English abbreviation "R" for Range
• Theta (Greek θ) for the associated heading (direction or bearing) measurement.

References

1. "The Airline Pilots Forum and Resource".
2. "A navigation primer". Flightglobal.com. Retrieved 11 October 2018.
3. Dodington, Sven H.; Greenspan, Richard L. (2020). "Rho-theta system". Access Science. doi:10.1036/1097-8542.587300.
4. "- YouTube". YouTube.

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