我记得以前应该写过CMV的事情的呀，怎么又找不到了。难道我得了健忘症？以下是CMV的用法：
Where RVR is available, visibilities up to and including 1600m are expressed in RVR. All visibilities above 1600m are shown as CMV. A reported meteorological visibility must be converted into RVR/CMV by applying different conversion factors for the lighting elements in operation under day/night conditions.
摘自戳
不过有个春秋的朋友提出的问题我也无法回答：使用CMV标准时，国内公司如何计算备降标准？目前好像是法规空白。真希望能找个日本签派员来问问。