Strange Behaviour of AI (Pathfinding)

[OKO]

using pathfinding instruction must solve this problem

put a WP on each side of land, using pathfinding instruction, and you will see the ship is able to avoid ground contact by himself.

at start, use a script =>

name : initgame
event trigger
automatic
run script : pathfind

script =>
name : pathfind
pathfinding / for / your plateform / is on

now you can kill all WP to get out of the harbor, just put one at the end of the harbor and let the script do the thing.
should work for you as it works here.