A true heading of 090 degrees is paired with 5 degrees east magnetic variation. What is the magnetic heading?

### Why this is right For the stated true-to-magnetic convention, easterly variation is subtracted. Subtracting 5 degrees from 090 degrees gives 085 degrees. ### The concept True heading is measured from true north, while magnetic heading is referenced to magnetic north. Variation is the angle between those north references. The mnemonic “east is least” captures the stated rule: subtract east variation when converting true to magnetic. Deviation is a separate correction applied later to convert magnetic direction to compass direction. ### The other options - **095 degrees**: This adds east variation, the opposite of the stated convention; adding is used for west variation here. - **090 degrees**: This ignores the 5-degree variation. - **080 degrees**: This subtracts 10 degrees rather than the stated 5 degrees. ### Worked numbers - **Given**: true heading 090 degrees; east variation 5 degrees. - **Find**: magnetic heading in degrees. - **Formula**: east variation is subtracted from true direction. - **Solve**: 090 degrees − 5 degrees = 085 degrees. - **Answer**: 085 degrees magnetic. - **Check**: subtracting east variation makes the magnetic value lower than the true value. ### Terms - **True heading**: The aircraft's direction referenced to true north. - **Magnetic variation**: The angular difference between true north and magnetic north. - **Magnetic heading**: The aircraft's direction referenced to magnetic north. ### Remember For true to magnetic in this material, east is subtracted and west is added.