Primage

Webster's Dictionary of the English Language

·noun A charge in addition to the freight; originally, a gratuity to the captain for his particular care of the goods (sometimes called hat money), but now belonging to the owners or freighters of the vessel, unless by special agreement the whole or part is assigned to the captain.

Related Words

primage
n. The word is of old commercial use,for a small sum of money formerly paid to the captain or maste...

Dictionary of Australasian Words Phrases and Usages by Edward E. Morris
primage
Premium of insurance. Also, a small allowance at the water side to master and mariner for each pack ...

The Sailor's Word-Book