I tool Walkies on my last cruise. If you have a cheap pair that doesn't have privacy of course you're gonna hear everyone else who has cheap ones without privacy. We got two set for less than $70 and set them all to the same channel 19 with a privacy code of 77.. We didn't hear anyone on our channel besides us.
They worked well when we were out and about the ship and wanted to check in. They also worked on the islands, on the beach, on some tours and they came in pretty dag on handy.