This is an Official Player's Guide from the Pirates Online Website.
A good captain never loses contact with a trusty mate. By opening your Friends Panel and clicking on Crew, you can see all the members of your Crew and view their Detail Panel. To send a message to everyone in your Crew wherever they happen to be, click on the Crew Tab on top of the chat interface, and then send your message. Crew messages will show up in purple in the Chat Log.