Offshore supply vessel (OSV) means a vessel that -
(1) Is propelled by machinery other than steam;
(2) Is of above 15 gross tons and of less than 500 gross tons (as measured under the Standard, Dual, or Simplified Measurement System under part 69, subpart C, D, or E, of this chapter), or is less than 6,000 gross tons (as measured under the Convention Measurement System under part 69, subpart B, of this chapter); and
(3) Regularly carries goods, supplies, or equipment in support of exploration, exploitation, or production of offshore mineral or energy resources.
46 CFR § 175.400
The following terms are used in this subchapter: