A:AnswerIt worked on the ship we were on, Carnival Inspiration. I'm sure it all depends on the distance and size of ship you're using them on. Sorry, not too familiar with these on larger ships.
A:Answercharge 1 at at time with the supplied cable or use a higher quality cable with one output and the radios will charge faster. my charging cable im using will change colors when the connected item is done charging, thats how i know they are charged.
A:Answerthe set i used worked well on the last 2 camping trips to Yosemite. Distance was roughly 3 to 5miles. Where cellphones didn't work at all or only in the open away from trees & hillsides.