Do not disturb signs?

[FrHoffard]

We are scheduled for our 1st cruise in October on Navigator so please forgive my ignorance.   Do the cabins have "do not disturb" door hangers for when we are in the cabin during that day and don't want the steward to come in?  If they don't,  can I bring one? Thank you

[Snowchaser]

Yep, most of the time there is a small reversible magnet to let the room steward know if your in or out. 

[Pattycruise]

Magnet that says “sleeping off the adventure” on one side and “out catching thrills” (something like that) on the other  

when you go to bed be sure to put out the magnets facing to appropriate side.

when you leave in the morning flip the magnet.  The steward than knows you are out and will clean the room.  When they are done they leave the magnet on the inside of the door. 
try and do the same for dinner, but if you forget they know the dinner time, I imagine they knock a few times and let themselves in.

you can flip the lock in your cabin while inside, that would prevent the steward from entering, as well as anyone else who has your key so be careful you don’t lock out family members 

[Qeyton Dude]

and if the magnet isn't there on day one just ask for one.  On Oasis a couple weeks ago the "kids gang" ran around the ship one night re-distributing them.  We even saw one on the out side (not the doors, but facing the atrium) of an elevator.  First time seeing anything like that happen for us.