Im thinking of an item used in a similar fashion to a cursed cannon ball except its intended to be uses on your own ship rather than another persons.
To activate the item it could be cooked on the stove and whilst its burning the effect takes hold til the item dissolves and disappears.
The speed boost doesnt have to be long. It can be found like any other cursed cannon ball and with RNG, probably wont be overly abundant like others arent too.
What it would mean though is that stocking up matters.
Use the item to catch ships or escape or just travel somewhere quicker.
No idea what the item could be but perhaps it could be a skull or something that imbues the ship with the spectral sailing abilities as skeleton ships.
Perhaps a ritual skull with blue tinted eyes something.
Eitherway its no more overpowering than a cursed cannon ball and not too intrusive.
