When converting true direction to magnetic direction using the stated convention, easterly variation is _____ and westerly variation is _____.

### Why this is right The supplied mnemonic is “east is least, west is best.” It means subtract easterly variation and add westerly variation when converting true direction to magnetic direction. ### The concept The sign depends on whether the variation is east or west and on the direction of conversion. This question specifies true to magnetic, so apply the convention exactly as stated. Do not use the same sign automatically for every direction-conversion problem; identify the starting and ending references first. ### Terms - **Easterly variation**: Variation designated east between true and magnetic north. - **Westerly variation**: Variation designated west between true and magnetic north. - **Magnetic direction**: A direction referenced to magnetic north. ### Remember For true to magnetic in this material, east is least and west is best.