To extend the search,especially for the wreck of the missing boat,a naw hydrographic vessel employed a proton magnetometer -- a powerful metal detector -- and side-scan sonar,which gives three-dimensional readings.

 
  • 为了扩大搜寻,特别是搜索失踪船只的残骸,一艘海军水道测量船采用了质子地磁仪,一种功率强大的金属探测器和侧扫描声纳。侧扫描声纳可以给出三维读数。
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