短語詞組短語magnetic course correction calculator 磁航曏脩正計(jì)算器diurnal magnetic correction 日磁校正multi -station magnetic diurnal variation correction 多臺站磁日變校正方法correction of magnetic variation 磁偏角改正correction for magnetic direction 磁方位校正correction of magnetic declination 磁偏角校正terrain correction for magnetic data 磁測地形改正 返回 magnetic correction