It is similar to your home shower, but not quite. You should pick up the faucet out of the sink and attach it to the holder on the wall, then turn on the water as usual. The water will NOT automatically drain from the floor. You must find a press a button for that. Its location varies, so it is a good idea to ask your captain where it is before hand – such as during “how to use the toilet” orientation. Warning: fresh water is scarce on the boat, so please use it sparingly, especially on long trips.