It's important to always provide your Membership Number when reserving a Royal Caribbean cruise vacation. Remind your travel advisor to include it. After all, your Crown & Anchor Membership Number is the only way we can make sure you receive all the recognition and benefits you deserve. So if you forget to include your Membership Number when making a reservation, you should bring it with you and provide it to the Loyalty Ambassador when you're onboard the ship. Your tier will be automatically printed on your SeaPass card if your number was included when making your reservation.