航路设计图对航线设计和大洋航行是必要的。
Routeing charts are essential for use in passage planning and ocean voyages.
航路设计图给出主要港口之间的航线和航程以及一年中每个月预计的气象和海洋状况。
The charts include routes and distance between major ports with expected meteorological and oceanographic conditions for each month of the year.
航路设计图给出主要港口之间的航线和航程以及一年中每个月预计的气象和海洋状况。
The charts include routes and distance between major ports with expected meteorological and oceanographic conditions for each month of the year.
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