GyroCop

GyroCop is a practical maritime navigation support app designed to help mariners perform bridge compass checks using celestial bodies. The app calculates the true bearing of the Sun, Moon, selected planets, and bright navigation stars based on date, UTC time, and vessel position. It then helps compare the calculated true bearing with the observed gyro bearing and entered magnetic compass data to support gyro and magnetic compass error checks. Main features: • Celestial body selection for compass checks • Sun, Moon, planet, and bright star calculations • True bearing calculation • Editable observed gyro bearing • Gyro error calculation • Magnetic compass check support • Variation and deviation input • Deviation card support • Saved compass check history • PDF export and sharing • Manual position entry • Optional device GPS position fill • Clean maritime-focused interface GyroCop is intended for deck officers, cadets, navigators, and maritime professionals who need a quick, structured way to support routine compass checks on board. The app is designed to work without requiring an account or online service. Calculation inputs and saved history are stored locally on the device. Important: GyroCop is a calculation aid only. It does not replace official nautical publications, approved navigation equipment, company procedures, bridge team practices, or professional judgment. Always verify results using appropriate onboard procedures and official navigational methods.