Running into head seas

Boat handling · Power & sail

Driving into the seas pounds the boat and the crew. Slowing down, trimming the bow down and taking the waves a little off the bow usually give a safer, drier ride. Decide early whether to carry on, change course or turn back.

Safety first

Becoming airborne and slamming down can injure backs and break bones as well as damage the boat. Seat the crew where the motion is least, often near the helm, and warn them before big waves.
Never let a wave break over the bow. If one is about to, slow down or stop so it breaks ahead of you, then regain headway.
Turning back puts you in following seas. Pick a lull and turn briskly: slow for a few seconds, put the helm hard over and add power so you are beam-on as briefly as possible. Do not start the turn on the face of a steep wave.

Speed

Slow down as the seas build. Pounding and launching off crests strain the hull and can injure people aboard, and a crew that has to fight just to hang on cannot do its jobs.
In bigger waves, work each one: enough power to carry the bow up and over the crest, ease off as you come down the back, then a little more power in the trough so you still have steering for the next wave.
Short, steep chop can force you slower than a bigger, long-period swell does. Look for the speed at which the boat neither buries its bow nor leaves the water.
If it gets too rough, slow to bare steerageway with the seas on the bow, using just enough power to get over each wave.

Trim and weight

On boats with trim tabs, trimming the bow down in head seas lets the sharp forward part of the V cut into the waves instead of slamming on the flatter sections further aft.
Stow and lash loose gear before it gets rough. Loose weight thrown to one side affects stability and can break windows or fittings.

Quartering the seas

Taking larger head seas a little off one bow often softens the ride: the boat eases off the back of each wave instead of slamming. The Coast Guard calls this quartering the seas, which is not the same as running with seas on the quarter.
The USCG boat crew handbook suggests about 45 degrees off the swell when pitching gets too hard, and the BoatUS Foundation gives the same angle for meeting waves in a storm. Adjust the angle and speed until the ride is easiest.
If your course would put the seas on the beam, zigzag toward it in long legs instead (see Beam seas and rolling).

Spray and visibility

Spray on the windshield hides waves, buoys and other boats, worst of all at night or in glare. Slowing down cuts the spray; keep the glass clean and the wipers working.
The Rules still apply in rough water. Rule 6 counts visibility, sea state and your boat's handling when judging a safe speed, and Rule 5 requires a proper lookout by sight, hearing and all available means.

Sources (3)

higherlogicdownload.s3.amazonaws.com · boatus.org · navcen.uscg.gov

General guidance for recreational boaters, researched from the sources listed and written in our own words. Your equipment manuals, local knowledge, the Navigation Rules and a qualified instructor come first.