Rho Theta Navigation

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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). {{Cite web|url=https://www.theairlinepilots.com/forum/viewtopic.php?t=866|title = The Airline Pilots Forum and Resource}}

The term "Rho-Theta" consists of the two Greek letters corresponding to Rho and Theta:{{cite web|url=https://www.flightglobal.com/pdfarchive/view/1985/1985%20-%202470.html|title=A navigation primer |website=Flightglobal.com|accessdate=11 October 2018}} {{Cite journal|url=https://www.accessscience.com/content/rho-theta-system/587300|doi = 10.1036/1097-8542.587300|title = Rho-theta system|journal = Access Science|year = 2020|last1 = Dodington|first1 = Sven H.|last2 = Greenspan|first2 = Richard L.|url-access = subscription}} {{Cite web|url=https://www.youtube.com/watch?v=6GVDfms2plY|title = - YouTube|website = YouTube}}

• 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.