21.360818,98.149058
29,490KM-80KM=29,410KM
https://tw.news.yahoo.com/%E6%B3%95%E6%8B%8D%E5%B7%A8%E6%B5%AA-%E5%B0%87%E4%BE%86%E8%87%A8-%E6%88%BF%E8%B2%B8%E9%81%95%E7%B4