On a similar situation, someone try Meshtastic and it works great https://old.reddit.com/r/meshtastic/comments/1qd2z97/mestastic_on_family_cruise_worked_great_

On a similar situation, someone try Meshtastic and it works great https://old.reddit.com/r/meshtastic/comments/1qd2z97/mestastic_on_family_cruise_worked_great_for/ https://old.reddit.com/r/meshtastic/comments/1qd2z97/mestast... I doubt that BLE can propagate well over a cruise ship.