How to Calculate Gyro Error & Compass Deviation Using Moon | ABC Method Step-by-Step

Learn how to calculate gyro error and compass deviation using the Moon as the celestial body. In this step-by-step tutorial, you'll learn the ABC Method, determine the Greenwich Hour Angle (GHA), Local Hour Angle (LHA), and declination from the Nautical Almanac, and compute the Moon's true bearing using both a scientific calculator and Norie's Nautical Tables. Finally, you'll use the results to determine the ship's gyro error, true course, magnetic error, and compass deviation through a complete worked example. #astronomy #gyroerror #celestialnavigation #navigation #maritime #seafarer #seaman #bsmt