POV: HOW TO CALCULATE GYRO ERROR BY SUN☀️ (ABC METHOD- UNTIL T/B ONLY)PART 2️⃣! скачать в хорошем качестве

POV: HOW TO CALCULATE GYRO ERROR BY SUN☀️ (ABC METHOD- UNTIL T/B ONLY)PART 2️⃣!

POV: HOW TO CALCULATE GYRO ERROR BY SUN☀️ (ABC METHOD- UNTIL T/B ONLY) PART 2️⃣! What is the ABC Method? The ABC method is a quick gyro error check using: • Azimuth (true bearing of the Sun) • Bearing (observed gyro bearing) • Correction (gyro error) Formula-wise, it’s simply comparing true azimuth with gyro bearing, but Norie’s Tables help you find the Sun’s true azimuth (A) accurately. ⸻ Data Required Before opening Norie’s Tables, you need: 1. Date 2. GMT of observation 3. Ship’s DR Latitude 4. Ship’s DR Longitude 5. Gyro bearing of the Sun (GB) ⸻ Step-by-Step Procedure (ABC Method) STEP 1: Find Sun’s Declination From Nautical Almanac: • Use the date & GMT • Interpolate declination if required 📌 Result → Sun’s Declination (Dec) ⸻ STEP 2: Find Local Hour Angle (LHA Sun) 1. From Nautical Almanac, take GHA Sun 2. Apply longitude: • LHA = GHA + Long (W) • LHA = GHA − Long (E) 📌 Result → LHA Sun ⸻ STEP 3: Enter Norie’s Tables (Azimuth Section) Using: • Latitude • Declination • LHA From Norie’s Tables: • Extract Sun’s True Azimuth (Zn) ⚠️ Apply the correct name (quadrant): • Morning / Afternoon • North / South • East / West (based on latitude & declination) 📌 Result → True Azimuth (A) ⸻ STEP 4: Compare with Gyro Bearing Now apply the ABC rule: Gyro Error = True Azimuth − Gyro Bearing 📌 Always label E or W clearly Why It’s Called ABC • A → Azimuth (from Norie’s) • B → Bearing (Gyro observed) • C → Correction (Gyro Error) Thank you! #ConcernedProfessor #fyp #SEAMAN #youtubeshorts