🧭 Gyro and Compass Error Calculator

Calculate Gyro Error, True Course, Magnetic Course, Compass Course, and Compass Error with precision

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Position, Date, & Time

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°'
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Celestial Body

Compass Readings

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°
°
°

How to Use This Calculator

Instructions:

  1. 1.Enter your position (latitude and longitude), date, and UTC time.
  2. 2.Select the celestial body you are observing.
  3. 3.Enter your compass readings including gyro course, gyro bearing, variation, and deviation.
  4. 4.Click the "Calculate" button to determine Gyro Error, True Course, Magnetic Course, Compass Course, and Compass Error.

Definitions:

  • Gyro Error:

    The difference between true north and gyro north.

  • True Course:

    The course corrected for gyro error.

  • Variation:

    The difference between true north and magnetic north.

  • Deviation:

    The error caused by local magnetic fields on the vessel.

  • Magnetic Course:

    True course corrected for variation.

  • Compass Course:

    Magnetic course corrected for deviation.

  • Compass Error:

    The total error between true course and compass course.

Common Uses:

  • Navigation and course plotting
  • Celestial navigation calculations
  • Gyro compass calibration & checking
  • Marine and maritime applications