GPS导航电文相关的计算程序，主要应用于GPS的RENIX文件读写及生成计算。-GPS navigation messages related to the calculation procedures, mainly used GPS RENIX document literacy and generate calculated.

对GPS导航星历（RINEX格式）的读取，可用于GPS卫星的定位和导航-GPS navigation on the ephemeris (RINEX format) reader, can be used in GPS satellite positioning and navigation