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Great Circle Calculator
Great Circle Calculator is a professional navigation utility for calculating great-circle (orthodrome) routes on a spherical Earth. The app allows users to enter departure and arrival coordinates in decimal degrees and computes key navigational values used in marine and aviation navigation. Features Great-circle distance (nautical miles and kilometers) Initial true course (0–360°) Final true course Northern and southern great-circle vertices (maximum and minimum latitude) Correct handling of longitude normalization and International Date Line crossings Technical details Spherical Earth model (orthodrome) Calculations based on classical great-circle navigation theory Input and output in decimal degrees Courses are true courses (not magnetic) Intended use This app is designed for navigators, sailors, pilots, students, and anyone interested in terrestrial navigation and spherical geometry. It is a calculation tool only and does not provide real-time navigation or positioning. Data & privacy No user data is collected No tracking No ads No internet connection required (except for optional external links)