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
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POV: HOW TO CALCULATE GYRO ERROR BY SUN☀️ (ABC METHO…
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FacebookProf. Kris Minion
Gyro error is the difference between a true bearing and the bearing shown by a gyrocompass. To calculate it, compare the gyro bearing to a known true bearing (e.g., from leading lights or a landmarks). The error is calculated by subtracting the gyro bearing from the true bearing. The error is "west" if the gyro bearing is greater and "east" if it is less. On this examples we can obtain the following given numbers: True Bearing: plotted direction on the chart Gyro Bearing: gyro compass direction
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Gyro error is the difference between a true bearing and the bearing sho…
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FacebookProf. Kris Minion
POV: HOW TO CALCULATE GYRO ERROR BY SUN ☀️ (LAST PART) PART B: CORRECTING AND UNCORRECTING THE COMPASS This is where many cadets get confused — remember this golden rule: 🟢 “Add East, Subtract West” (From Compass → True) ⸻ 1️⃣ Correcting the Gyro Compass (GB → TB) If you know the Gyro Error and want True Bearing: • GE East → ADD • GE West → SUBTRACT Example: • Gyro Bearing = 250° • Gyro Error = 2°E True Bearing = 250° 2° = 252° 2️⃣ Uncorrecting the Gyro Compass (TB → GB) If you know the True Be
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POV: HOW TO CALCULATE GYRO ERROR BY SUN ☀️ (LAST PART…
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FacebookProf. Kris Minion
Compass Variation and Deviation - how to calculate them - Building The Best Powerboat Company In Britain
Compass Variation and Deviation - how to calculate them - Building T…
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getlostpowerboattraining.com
🟥SUBJECT: GYRO ERROR SAMPLE COMPUTATION Here’s a sample calculation for finding the gyro error. I usually use an Excel calculator for quick results, but it’s also good to review the manual method. Knowing both helps you stay sharp and well-rounded in navigation. =========== Sample calculation (Azimuth-Sun): On 09th of May 2006 at 05h 30m 00s UTC, a vessel in position 55° 00'N & 002° 00'W observed the Sun bearing 073° by magnetic compass. Find the compass error. If variation is 5 W, calculate th
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🟥SUBJECT: GYRO ERROR SAMPLE COMPUTATION Here’s a sample c…
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