Routeing charts are essential for use in passage planning and ocean voyages.
航路设计图对航线设计和大洋航行是必要的。
The methods of traditional passage planning are very complicated, and inconvenient.
传统的航线设计方法十分繁琐，使用起来也极不方便。
The methods of traditional passage planning are very complicated, and inconvenient.
传统的航线设计方法十分繁琐，使用起来也极不方便。
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