A.A vessel engaged in laying，servicing or picking up a navigation mark，submarine cable or pipeline
B.A vessel engaged in dredging，surveying or underwater operations
C.A vessel engaged in replenishment or transferring persons，provisions or cargo while underway
D.A power driven vessel which because of her draught in relation to the available depth and width of navigation water is severely restricted in her ability to deviate from the course she is following
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