[caww]

This gives a small indication of the waves they had to fight to get on the beach...and certainly attests to why they were getting sea-sick prior.

[Pelham]

The waves were running at 6 feet that day, and you’re right that is why the GIs were getting seasick. It’s also why the DD tanks were sinking.. the floats were designed for something more like 2 foot seas. At Omaha there was also a strong current pushing the landing craft to the east.