I looked around for info about the MMSI and while I don't need one now, I plan to add capabilities to my boat that require one. So, I decided to go ahead and apply for one now to it will be on hand.
I made this blog post showing lots of screen shots to give people an idea of what to expect. I also included the links to the FCC ULS website in case someone needs to register and apply online.
Rhapsody: How do you get an MMSI from the FCC?
The process didn't take long.
Also, as a note, the cost is $160.