Water resistance is measured at a static or motionless state.
See Also
3 Things You Don't Know About Water ResistanceShould You Wear Your Watch In Water? - The Watch DoctorWhat makes Watches so Valuable?Seiko 5 Dive Watch for Your Perfect Experience in the WaterATM or “atmospheres” is the amount of pressure a watch can withstand. 5ATM will withstand pressures equivalent to about 50 meters, or 164 ft under water. It is important to note that this is a measure of pressure NOT depth. 5ATM doesn’t mean the watch can be used diving to a depth of 50 meters.
Note: The watch can be used for shallow-water activities like swimming in a pool or ocean. It can’t be used when you are taking a shower/bath or diving into water.
