(a) A seaman who fails to be on board at the time contained in the agreement required by section 10502 of this title, without having given 24 hours notice of inability to do so, shall forfeit, for each hours lateness, one-half of one days pay to be deducted from the seamans wages if the lateness is recorded in the official logbook on the date of the violation.

(b) A seaman who does not report at all or subsequently deserts forfeits all wages.

(c) This section does not apply to a fishing or whaling vessel or a yacht.