If you can read the sign and think the spelling is wrong, let me assure you that it isn’t. International law requires that a ship conduct a muster drill to prepare the passengers in case of emergency. In Royal Caribbean ships, the muster drill is conducted before the ship sails. There is a demonstration of the use of the life vest, etcetera, much like how flight attendants do it before the plane takes off. The difference between planes and ships is that because a ship has thousands of passengers instead of a few hundreds, each passenger is assigned to a specific muster station and each muster station is under the charge of a team of crew members. Easier to count heads that way.
So there’s no misspelling. It is a muster station, it’s where the muster drill is conducted and it’s where passengers gather when there is an emergency. I hope you can see one of the lifeboats in the photo.
P. S. When there is no on-going drill, this place is also my smoking area.