I recognize this is a bit of an old thread, and I welcome any redirect to a more current conversation. I recently started working for the Navy on AI for autonomous navigation of mid-sized to larger vessels (100’ to 1000’) in threateningly high seas (8m or greater wave height), and I was wondering, …

This is an interesting point of view, and I agree with a lot of it. An autonomous system will have to be designed to not NEED to worry about many things a human crew does, and a well-designed autonomous craft would differ significantly from ships intended for human operation. However, it is my exper…

There are things manned cargo ships have to deal with that an autonomous warship won’t have to deal with. Cargo. People. Already addressed by others. Other things, for example, a cargo ship wouldn’t expect to list more than several degrees so things like tank bell mouths and sumps are built with t…

[image] DeckApe: As nutty as it sounds to us maybe a small or medium sized unmanned warship could weather bad seas by going parallel or diagonal to the swells? I have no idea. I’m just thinking that what we’ve always done might not necessarily apply. This is an interesting idea that brings up…

[image] Heavy Weather Tactics Professional Mariner Forum I’ve tested the theory on fishing boats in rough weather in the Bering Sea. It works well most of the time… I think a lot has to do with the vessel’s superstructure configuration and sail area. Not every ship will la…

I can only speak to the lower end of your range, but first thing is autopilot OFF. You can always tell when a new helmsman comes on duty, you’ll get woken up CRASH BANG as the new guy misjudges the waves. It is more like an art then a science, you feel with your feet and maybe your hands depending o…

With adaptive auto pilot it’s often better to leave the autopilot engaged if possible. [image] Following Seas and Follow Up Steering Professional Mariner Forum We keep it on the mike as much as possible because hand steering requires calling out a second AB for watch, som…

Old rule of thumb;Ship rides best taking the waves “2 POINT OFF THE HEADING”. Of course the speed has to be adjusted as well to get the best result.

Regarding “2 Points off heading”: Does that mean 2 degrees off of straight into the waves? Couldn’t the direct heading be in any direction relative to the swell?

Each point is 11-1/4 degrees, so 22.5 degrees.

You need the sea off the bow to ease your motion otherwise you are just crashing up and down. Going in at an angle reduces the pitching somewhat and increases the rolling a bit. It is a matter of trial and error to find the best angle of attack with the best matched speed. I don’t think that acce…

Seakeeping for Autonomous Ship in Heavy Weather

Professional Mariner Forum

Kennebec_Captain February 18, 2020, 2:53pm 30

With adaptive auto pilot it’s often better to leave the autopilot engaged if possible.

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Seakeeping for Autonomous Ship in Heavy Weather

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