If you are tapping your cruise card on the device it indicates it has a passive near field device in it otherwise known as an RF ID tag. Guess what? The Medallion readers all over the ship have both bluetooth and near field device readers.
A dolphin is a structure, typically with 3 legs, that stands out of the water and can either have a day mark or light on it or be a place to tie up a ship. ( I would need to dig out a reference or two to check the typical height above mean high tide). Baha is not an obscure definition.
The names appear to be have chosen to be phonetically distinctive and easy to teach crew to recognize.
The price of decent wine in the UK is high relatively speaking so they are used to high prices. That went over your head.
"A glass of decent wine is £15."
£15 is about 18 USD at current exchange rates.