What's a "Muster Drill" on a Cruise?

Here's the first thing you should do when you get on a cruise ship, and that's to go ahead and bang out your required mustard drill.

And no, it's not mustard drill, it's muster drill.

Kids will receive a little wristband to confirm that they completed the muster drill and tip.

Now, of course, mustering is important because you need to know where to go in the case of an emergency.