Pitching

pitching - The plunging motion of a vessel when she dives by the head; the opposite motion to ascending, which is rising by the head and sinking by the stern.
planing hull - A hull specifically designed to reduce friction and increase speed.

Pitching - Rising and falling of the bow versus Roll which is sideways rocking
Porpoise (Porpoising) - The rhythmic bouncing of the nose of a planing boat, often caused by over-trim or hull irregularities
Port - Window on a boat ...

Pitching-The movement of a ship, by which she plunges her head and after-part alternately into the hollow of the sea.
Pitchpoling -boat being thrown end-over-end in very rough seas.

PITCHING - Vertical motion when bow rises and falls
PILOTING - Navigation by use of visible references, the depth of the water, etc.
PLANE - A boat moving across water surface at speed with minimal water displacement by hull.

The boat's pitching, rolling, and heeling. A boat with an easy motion is comfortable.
motor ...

Heavy rolling or pitching while underway.
Lacing
A line used to attach a sail to a spar.

In Greek and Roman vessels two sets were sometimes employed, so that if the pitching of the ship lifted the after pair out of the water, the foremost pair could still act.

is suspended so as to remain in a constant horizontal position irrespective of the rolling or pitching of the vessel.

The little cutter -- she was only fifteen tons -- was pitching and 'scending at such a lively rate that lighting a fire in the stove was out of the question.

labor - Heavy rolling or pitching while underway.
lacing - A lineline used to attach a sail to a spar.
laid up - A boat in a dry dock.

*If you have a choice of berths, choose the one forward in the cabin as it it likely to have less pitching motion. Also, sleep on your back.
*Keep busy and positive. If you worry too about getting sea sickness, you probably will.

A side to side motion of the boat, usually caused by waves. Also see pitching and yawing.
roller
a wave ...

In either case pitching (rocking horse-like motion) is reduced. This has led to it being said that catamarans are especially favourable in coastal waters, where the often sheltered waters permit the boat to reach and maintain its maximum speed.

Nearing the pitching Bavaria 40 he accelerated toward the port quarter and then quickly slowed as I clutched the stern pulpit to steady myself. With my trusty notebook in hand I plopped aboard and pushed the Whaler away.

If a sailor's station is at the weather bow, he may become tired of the pitching of the boat and the constant spray blown into his face. He will most certainly be under the weather.