Mod Sunless Sea for a faster-turning ship

Edit a file: navigationconstants.json.

(Linux path: ~/.config/unity3d/Failbetter Games/Sunless Sea/constants/navigationconstants.json)

You see a bunch of values in this file, such as BaseShipTurningSpeed. Despite what you'd expect, that one only makes a small difference, but let's set it to an extreme value anyway:

"BaseShipTurningSpeed": 99999,

The rest is down to a complex formula that basically means the faster your ship, the slower it gonna turn. There is a trick: accept a very slow base speed, then increase TurboSpeedMultiplier to compensate:

"BaseShipSpeedLimit": 0.000005,
"TurboSpeedMultiplier": 10.00,

Consequences:

1. You'd have to always turbo to get anywhere
2. The Engine Power stat does nothing

With the above, you're so dependent on turbo you may want another hack to "keep it on" with less user involvement. Unfortunately or not, it's also an infinite-fuel cheat:

"FuelUpdatePeriod": 1000,

"DiveTime": 2,