46 CFR §169.103

1. (a)This subchapter applies to each domestic vessel operating as a sailing school vessel.
2. (b)This subchapter does not apply to—
   1. (1)Any vessel operating exclusively on inland waters, which are not navigable waters of the United States;
   2. (2)Any vessel while laid up, dismantled, and out of service;
   3. (3)Any vessel with title vested in the United States and which is used for public purposes except vessels of the U.S. Maritime Administration;
   4. (4)Any vessel carrying one or more passengers;
   5. (5)Any vessel operating under the authority of a current valid certificate of inspection issued per the requirements of 46 CFR chapter I, subchapter H or T, 46 CFR parts 70 through 78 and parts 175 through 187, respectively; or
   6. (6)Any foreign vessel.
3. (c)A vessel which engages in trade or commerce or carries one or more passengers, cannot operate under a certificate of inspection as a sailing school vessel, but must meet the rules and regulations governing the service in which it is engaged.