Section 7312(a) provides that able seamen—unlimited may constitute all of the able seamen required on a vessel.

Subsection (b) provides that able seamen—limited may constitute 100 percent of the able seamen required on board vessels of less than 600 gross tons operating on the Great Lakes and 50 percent of the number of able seamen required on the larger vessels.

Subsection (c) provides that able seamen—special may constitute 100 percent of the able seamen required on vessels not more than 500 gross tons, or a seagoing barge or towing vessel. Able seamen—special may only constitute up to 50 percent of the number of able seamen required on other vessels.

Subsection (d) provides that able seamen—offshore supply vessels may constitute 100 percent of the number of able seamen required on vessels of less than 500 gross tons engaged in support of exploration, exploitation, or production of offshore mineral or energy facilities. They may not serve on board other vessels as an able seaman until they have the appropriate required document.

Subsection (e) provides that the total number of able seamen—limited or able seamen—special may not be greater than 50 percent of the required number of able seamen on a vessel.

2010—Subsec. (d). Pub. L. 111–281 amended subsec. (d) generally. Prior to amendment, subsec. (d) read as follows: “Individuals qualified as able seamen—offshore supply vessels under section 7310 of this title may constitute all of the able seamen required on board a vessel of less than 500 gross tons as measured under section 14502 of this title, or an alternate tonnage measured under section 14302 of this title as prescribed by the Secretary under section 14104 of this title engaged in support of exploration, exploitation, or production of offshore mineral or energy resources.”

1996—Subsec. (b). Pub. L. 104–324, § 723(1), inserted “as measured under section 14502 of this title, or an alternate tonnage measured under section 14302 of this title as prescribed by the Secretary under section 14104 of this title” after “1,600 gross tons”.

Subsec. (c)(1). Pub. L. 104–324, § 723(2), inserted “as measured under section 14502 of this title, or an alternate tonnage measured under section 14302 of this title as prescribed by the Secretary under section 14104 of this title” after “500 gross tons”.

Subsec. (d). Pub. L. 104–324, § 723(3), inserted “as measured under section 14502 of this title, or an alternate tonnage measured under section 14302 of this title as prescribed by the Secretary under section 14104 of this title” after “500 gross tons”.

Subsec. (f)(1). Pub. L. 104–324, § 723(4), inserted “as measured under section 14502 of this title, or an alternate tonnage measured under section 14302 of this title as prescribed by the Secretary under section 14104 of this title” after “5,000 gross tons”.

Subsec. (f)(2). Pub. L. 104–324, § 723(5), inserted “as measured under section 14502 of this title, or an alternate tonnage measured under section 14302 of this title as prescribed by the Secretary under section 14104 of this title” after “5,000 gross tons”.

1986—Subsec. (e). Pub. L. 99–307 substituted “able seamen—limited” for “able seaman—limited”.

1984—Subsec. (f). Pub. L. 98–364 added subsec. (f).