Guilder
08-31-2019

Google Translate says:

"Phantom fog lights
In mysterious waters, the acceleration and turning speed of the ship
raise."

Incidentally, JP wiki says this is a passive skill. It can be obtained by using the following materials:

Black-mud x50 + Control Tower + Ship Light Mount

See the third ingredient's page for further details.

Source: gvo.gamedb.info/wiki/?Ship/Custom/ShipSkill

Alrn
03-08-2020

The number of Original Ship Permit that you need for this skill is 2, so combine that with the list of materials needed Guilder wrote above. Anyway, i managed to add this seemingly interesting skill to my ship, and after doing test drive, i'd say it is also increases 20-30% speed to ship during SoW at best.

I feel that this kinda adds somehow to the question of why Sea of Wonders dramatically reduces +20%/+25% cargo ship speed despite having big amount of sails compared -20%/-25% non-rowing adventure and rowing ship (I tested this with Susan Constant +20% cargo and my God it sails like crap there).

It turns out that when this ship skill says "Increase acceleration and turn speed on Seas of Wonders", it also adds speed increase to the ship as well. Perhaps, Sea of Wonders reduces the ship speed also based on the ship's acceleration than just the ship's top speed. Which is why non-rowing adventure ship and rowing ship don't get much reduction because their fast acceleration compared to trade ship that gets +20%/+25% cargo.

There is still question about what if you use Clermont or Savanna with coal fuel power rather than relying on wind power on Sea of Wonders? Will this skill helps to increase your ship turn speed and acceleration during the battle Leviathan or Cetus? But since i don't think many people has the skill (due of the rarity of Suspicious Mud of course), it will be long time to wait for final answer.

Anyway, it's still my theory so of course i would love to hear thoughts and discussion related to this matter. I'd say it's kinda worth to get the skill especially for upcoming Chapter 3 where you really need to do a lot of mutiple Sea of Wonders run especially to aim either Phantom Paneling for ship builders or Legendary Key Staff for adventurers.