A hopper dredge may be issued a working freeboard on a limited service domestic voyage load line certificate or a Great Lakes load line certificate if the following are met:
(a) The hopper dredge structure must have adequate strength for any draft up to the working freeboard draft. Dredges built and maintained in conformity with the requirements of a classification society recognized by the Commandant usually meet this requirement.
(b) The hopper dredge must -
(1) Meet subpart I of part 174 of this chapter; and
(2) Have on its bridge remote draft indicators that:
(i) Show the fore, aft, and mean draft of the dredge at all times while the dredge is operating; and
(ii) Have each indicator marked with the assigned freeboard and the working freeboard.