What does "Water Resistant" mean

What does "Water Resistant" mean
...when it's written on a watch? If you haven't figured out the water resistant watch depth measurement system (and I don't blame you), here it is (as far as I know):

Depth Meaning
Not mentioned Won't survive contact with water.
30m / "Water Resist" Splash proof, ie when washing hands
50m/ 5atm / "Water Resist" Can shower or play in water with it
100m / "Water Resistant" Can scuba dive with it

Some watches may leak if you push their buttons under water, so you might want to avoid that. Also, the watch might require some readjustment every year or so, since wear and tear loosens the packaging and various chemicals (like sweat) erodes it. This should be mentioned in the warranty card.