I've never been on a cruise, and I was wondering, how do people communicate with other people onboard?
First, you have to have a plan. My wife and I had arrangements made if we were separated where we would meet under most circumstances. NONE of them were at the cabin.
We also carried FRS/GMRS radio's and found them to work well on the ship. The silent call saves a lot of noise.
Respectfully,
Jerry