Royal Caribbean suggests passengers on their cruise ships should consider raising the tip rate for service workers on board. The tips start at $3.75 a day for waiters and $5 for cabin stewards. RC claims it’s the first time the tip amount suggestions have been raised in more than a dozen years.

While those tips are voluntary, RC and most other cruise lines add an automatic 15 percent as tips to bar tabs. The old adage that tips’ initials mean To Insure Prompt Service should still be the gauge on how much or how little a customer should give to service providers.