watch the weather report of coastal TV stations and most will give the "seas". 3-5, 4-6 ft swells, that kind of thing. the bigger, the worse they are. 8-10, don't even bother going out.
the scopalomine patch is God's greatest invention. i spent 7 years at UT's Marine Science Institute, and was constantly prone to seasickness. its not fair for a budding marine biologist with no damn money should be prone to sea sickness, but i was prone. big time.
i tried every f'ng thing known to man for the "mal du mer". dramamine, dramamine-D, buclidine, buclidine D, marazine, maraizine D, pickle juice, crackers, 7 up, eating, not eating. nothing worked. finally, after i left the coast, i discovered that God had invented the scopalomine patch. the miracle cure. don't leave home without it.