Sentence:  <WSD>Deckwise</WSD>, there was a Supreme Capt., an Assistant Supreme Capt., a deputy Supreme Capt., six Asst. Deputy Supreme Capts., six Jr. Asst. Deputy Supreme Capts., six Jr. Third Asst. Deputy Capts., and the usual number of Chief Mates, Asst. Chief Mates, Second Mates, Third Mates and Fourth Mates, about 72 mates in all, Dad thinks. 
Meaning of the word marked with <WSD> tags:  Concerning the deck.