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Compass correction card pdf 2025

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The document is a Magnetic Compass Deviation Table used for recording and adjusting the magnetic deviation of a ship's compass. It includes fields for the date, compass make and serial number, various headings, deviations, and adjustments related to compass calibration. The table is designed for navigational accuracy and is part of military documentation.

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What are the three types of compass errors?

Common Magnetic Compass Errors Variation. Deviation. Magnetic Dip. Oscillation. Northerly Turning Errors. Acceleration/Deceleration Errors.

Is a compass correction card required?

A: There is currently no regulatory requirement for pilots to maintain, or to use, compass deviation information.

How to calculate compass error ABC method?

ABC Method for Azimuth Calculation A = Tan(Lat) / Tan(LHA) B = Tan(Dec) / Sin(LHA) C = A (+/-) B based on the relationship between Latitude and Declination. Calculate CcosLat and find the Azimuth using trigonometric functions. Remember the rule: Compass Best Error (W) and Compass Least Error (E).

How to correct magnetic compass error?

0:58 9:17 And this difference between the two is your variation. The actual figure for it is given here in theMoreAnd this difference between the two is your variation. The actual figure for it is given here in the center of the rose. So you can see its 4 30 minutes west in 2015.

How to calculate compass error on ship pdf?

Your variation was 7 degrees west and as compass error = variation +/- deviation, your deviation in this instance is 1 degree west. The main point to remember is that deviation calculated only applies to the course the vessel was steering. Deviation changes with the heading and locality.

compass deviation card template

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How do you use a compass correction card?

The compass correction card tells you what to steer to achieve the appropriate heading. So if your card indicates 275 to steer 270 (W) then if your compass says 275 you set 270 on the DG. The card is calibrated every 30 degrees, so you may have to interpolate and estimate for nearby headings.

How to determine if gyro error is east or west?

If the true bearing is greater than the compass bearing, then the compass error is named E (east). If it is less than the compass bearing, the compass error is named W (west).

How do you calculate compass error on a ship?

Calculation If, Long East, LHA = GHA + LONG (- 360 as necessary) If, Long West, LHA = GHA LONG (+ 360 as necessary) p = LHA; (360-LHA, if LHA is more than 180)

Compass correction card pdf 2025

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