46 CFR §68.33

1. (a)A vessel which is documented and issued a limited coastwise endorsement under this subpart may operate on the navigable waters of the United States or in the EEZ in coastwise trade only for the following purposes:
   1. (1)To recover oil discharged into the water.
   2. (2)To transport oil discharged into the water.
   3. (3)To transport and deploy equipment, supplies, and personnel for recovering and transporting oil discharged into the water.
   4. (4)To conduct training exercises to prepare for performing the functions in paragraphs (a)(1) through (a)(3) of this section.
2. (b)This limited coastwise endorsement also entitles the vessel to any other employment for which a registry or fishery license is not required.
3. (c)A vessel which is documented and issued a limited coastwise endorsement under this subpart may qualify to operate for other purposes by meeting the applicable requirements of part 67 of this chapter.