https://blog.gongquiz.com/2023/01/05/loran-c-%ec%b2%b4%ec%9d%b8%ec%9d%84-%ea%b5%ac%ec%84%b1%ed%95%a8%ec%97%90-%ec%9e%88%ec%96%b4-%ec%86%a1%ec%8b%a0%ea%b5%ad%ec%9d%98-%eb%b0%b0%ec%b9%98%eb%a5%bc-%ea%b2%b0%ec%a0%95%ed%95%98%eb%8a%94/