We're using Meshtastic quite extensively for communication on our boat. Each crew member carries a mobile waterproof node (Seeed T1000e), the boat itself has a node, and we also have a Meshtastic tracker for the dinghy.

We often sail in places where there's no communication infrastructure, or it is prohibitively expensive. With Meshtastic we can talk when somebody goes ashore, and the boat can send telemetry and alerts to the remote crew.

Some of our buddy boats also have Meshtastic on board so we can text chat with them instead of using VHF.

Here's a story describing this: https://blog.noforeignland.com/off-grid-boat-communications-...