Four winns 318 VISTA Owner's Manual page 185

WATER.LINE.-.The.line.of.the.water.on.the.hull.when.
the vessel is afloat.
WATCH.-.A.4.hour.duty.period.while.at.sea.
WAVES.-.Waves.are.periodic.disturbances.of.the.
sea's.surface,.caused.by.wind,.seaquakes,.and.the.
gravitational.pull.of.the.moon.and.the.sun.
Glossary Owner's Manual Page