Hypothetically, what would happen if the ship were in port?
I assume the safest place for it to be would be out at sea. If they get a notice like this, do they just pull up anchor and split?
I see that this is supposed to affect just about every shoreline on the ocean to some degree.
It would depend on the port.
I believe it is the Big Island but it could be a differant island in Hawaii, that has a port that amplifies any and all tsunamis that come in. Natural underwater formation.
Ohau on the other hand, tends to be more protected from the tsunamis because of it's position in the island chain. So the ports there tend to be more protected.
The ports here in Okinawa have concrete barriers designed to break up the wave and disrupt the damage it would do.
Other factors that effect tsunamis and ports are coral reefs, ocean depth, shoreline, earthquake type/depth/strength and direction tsunami is coming from.
Out at sea would be safest, the tide height would be lower. But it would be a very hard call to make. If the ship/boat was not already out to sea, it might not be able to get far enough out to sea to ride out the tsunami. Not a call I would want to make.
As of right now Japan, has no tsunami warning/watch. We might have a bump in high tide or see a lower low tide.