While Princess Cruises encourages the use of the Medallion® as part of its core "MedallionClass" experience, it is essentially mandatory for most onboard functions. The Medallion acts as your room key, your payment method, and your identification for boarding and disembarking. It allows the crew to provide personalized service, such as food delivery to your exact location via the "OceanNow" service. If you have medical concerns, such as a pacemaker, the device is designed to meet RF safety standards, but you should consult your physician. While you might be able to request a traditional keycard at guest services in rare circumstances, doing so would disable nearly all the innovative features—like "keyless" cabin entry and the "Find My Friends" app—that define the Princess experience in 2026.