We have friends going with us that want to use their debit cards. Are they allowed? They will be sailing with us on the Diamond Sept.
, it's the same as cash.
That said, your friend should be aware that the debit card is a very bad idea in general. With a debit card, a fraudulent charge means that the money is gone from your account until the bank fixes the error and restores the cash. With a credit card, by contrast, the money does not actually leave your bank account until you pay the bill so fraudulent charges cannot wipe out your account.