I had to Google 'gedunks'... never heard that word before.

The Chief Steward opens the bond once a day... you can get cigarettes, sweets, chocolate, soft drinks, toiletries and the like, all at duty free prices for what it's worth (big savings for smokers I guess).

You used to be able to get very cheap bottles of spirits for consumption 'after you'd left the vessel', but the Camp Boss didn't seem to mind if you went back for another a few days later... he was making money! That's all long gone now of course.