Which corrections are applied to convert a true course to a magnetic compass course?

Which corrections are applied to convert a true course to a magnetic compass course?

• A. Deviation and Variation
• B. Latitude and Longitude
• C. Wind Correction
• D. Time and Distance

Answer: (A)

When converting a true course into what a magnetic compass would indicate, you account for two magnetic influences: variation and deviation. Variation is the difference between true north and magnetic north at your location, caused by the Earth's magnetic field. Deviation is the misalignment caused by the vessel’s own magnetic environment from its metal and onboard equipment. Apply these corrections to the true course to arrive at the magnetic compass course that would be read on the compass. Latitude/longitude, wind correction, and time/distance don’t describe this transformation.

When converting a true course into what a magnetic compass would indicate, you account for two magnetic influences: variation and deviation. Variation is the difference between true north and magnetic north at your location, caused by the Earth's magnetic field. Deviation is the misalignment caused by the vessel’s own magnetic environment from its metal and onboard equipment. Apply these corrections to the true course to arrive at the magnetic compass course that would be read on the compass. Latitude/longitude, wind correction, and time/distance don’t describe this transformation.