I agree with everybody. They do work, it's the person operating the walkie talkie you have to worry about! My husband told a female voice that he was going into port in St. Bart's while my 3 kids and I looked all over the ship for him! When we finally checked at the information desk, they looked in the computer and saw he had disembarked. Later when we finally caught up to each other (we actually passed on two different launches as he came back from the island) he told me, "But I told you I was going ashore and you said ok". Well it wasn't me! So perhaps code names are in order!