three-member cog

For quasi-real-time method, the real-values of COG and SOG are calculated by Mid-Latitude, Mercator or Bowring sailing method, the geographic coordinates obtained from DGPS are taken as the original datum of the three sailing method s.

在准实时法中，利用差分卫星定位仪给出的地理坐标，根据中分纬度法、墨卡托法或波林法算得航迹向与对地速度的真值。

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