Vessels over 300 gross tonnes must carry automatic identification system (AIS) transmitters, but the two AIS receivers in the Aleutians only cover about 10% of the islands.

 
  • 尽管毛重超过300吨的船只必须携带自动识别系统(AIS)发射器,但阿留申群岛上仅有的两个接受器只能覆盖岛屿的10%25。
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