Messaging: Send/receive messages with other passengers
Location tracking: Tells Princess system where your Medallion currently is located if on the ship. Normally it is with you. This allows you to use screens around the ship to locate someone else in your group by showing where their Medallion currently is. For example,using a screen near the elevators near the deck 6 dining room and see that the person you are looking for is (some possibilities) in the dining room, in the front row of the Princess Theater, in their cabin, in a rest room on deck 5, or wherever they might be on the ship.