Buoy mai alamar saman mu don nutsewa (SMB) na'urar aminci ce wacce duk masu ruwa da tsaki ya kamata su aiwatar da kowane nutsewa. Yana ba masu nutsewa damar yin alama a wurinsu lokacin da suke tsayawa tsaro, kammala tasha ko ba da alama idan sun tashi daga jirgin. Har ila yau, yana ba da damar masu nutsewa a bakin teku su yi alama a wurinsu.
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