The policies of the International Civil Aviation Organization (ICAO) relating to measurement are: there should be a single system of units throughout the world the single system should be the SI the use of the foot for altitude is a permitted variation.
国际民用航空组织（ICAO）与计量有关的政策为： 全世界应使用单一单位体系； 单一体系应是国际单位制； 在高度使用英尺是允许的变种。