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True to Magnetic Heading Formula:
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True to magnetic heading conversion is the process of adjusting true north headings to magnetic north headings by accounting for magnetic variation (also called declination). This is essential for navigation using magnetic compasses.
The calculator uses the standard aviation formula:
Where:
Explanation: Magnetic variation is the angle between true north and magnetic north at a specific location. East variation means magnetic north is east of true north, west variation means magnetic north is west of true north.
Details: Accurate heading conversion is crucial for navigation, aviation, and maritime operations. Using incorrect headings can lead to significant navigation errors, especially over long distances.
Tips: Enter true heading in degrees (0-360), variation in degrees, and select whether the variation is east or west. The calculator will provide the corresponding magnetic heading.
Q1: What is magnetic variation?
A: Magnetic variation (declination) is the angle between true north and magnetic north at a specific location, caused by the Earth's magnetic field not aligning with its rotational axis.
Q2: How do I find the magnetic variation for my location?
A: Magnetic variation can be found on aeronautical charts, nautical charts, or through various online tools and apps that provide current magnetic declination data.
Q3: Does magnetic variation change over time?
A: Yes, magnetic variation changes slowly over time as the Earth's magnetic field evolves. Navigation charts are regularly updated to reflect these changes.
Q4: What's the difference between variation and deviation?
A: Variation is the difference between true and magnetic north due to Earth's magnetic field. Deviation is the error caused by local magnetic disturbances on a vessel or aircraft.
Q5: How accurate is this conversion?
A: The conversion is mathematically precise. Accuracy depends on using the correct variation value for your specific location and time.