I once picked up some decals from a Coast Guard Auxiliary booth at the commercial fishing expo in Seattle. I haven't seen them handed out anywhere down here but due to the recent events I'm going to call the Auxiliary tomorrow and get some ordered.
I found the catalog number on a Coast Guard site so hopefully they are still available. These stickers contain both Mayday and Pan Pan dialog on them. They are probably 5" x 7" in size and have blanks that can be filled in by the captain for things such as "Boat Name", "Registration Number", etc. They can be stuck up near your VHF so your crewmen know exactly what needs to be said.
I will try to get as many of these as they will let me and perhaps we can get them all disbursed at TA meetings, tuna tournaments, whatever. In the meantime create your own!
Skein had a great idea of making some laminated cards with just enough info on them to give directions on how to use the GPS and VHF and attach them in a conspicious place so if the captain ever is disabled the crew will be able to run basic functions on the electronics.
As we can all tell by todays events it will only help your chances and speed up recovery.