46 USC 2111 - Pay for overtime services

(a) The Secretary may prescribe a reasonable rate of extra pay for overtime services of civilian officers and employees of the Coast Guard required to remain on duty between 5 p.m. and 8 a.m., or on Sundays or holidays, to perform services related to
(1) the inspection of vessels or their equipment;
(2) the engagement and discharge of crews of vessels;
(3) the measurement of vessels; and

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(4) the documentation of vessels.
(b) Except for Sundays and holidays, the overtime rate provided under subsection (a) of this section is one-half days additional pay for each 2 hours of overtime (or part of 2 hours of at least one hour). The total extra pay may be not more than 2 and one-half days pay for any one period from 5 p.m. to 8 a.m.
(c) The overtime rate provided under subsection (a) of this section for Sundays and holidays is 2 additional days pay.
(d) The owner, charterer, managing operator, agent, master, or individual in charge of the vessel shall pay the amount of the overtime pay provided under this section to the official designated by regulation. The official shall deposit the amount paid to the Treasury as miscellaneous receipts. Payment to the officer or employee entitled to the pay shall be made from the annual appropriations for salaries and expenses of the Coast Guard.
(e) The overtime pay provided under this section shall be paid if the authorized officers and employees have been ordered to report for duty and have reported, even if services requested were not performed.