The problem is as follows: When the player plots a course, the game engine uses the world coordinate system to determine the position of the waypoint, as opposed to the local coordinate system. That means, when you set a waypoint with the plotting tool, you tell the game to steer the boat to world coordinates xx°N XX°W or so. With local coordinates, you'd tell the game to steer 300° magnetic for 200 nm, then turn to 270° for another 100 miles or so. But changing plotting from world to local coordinate systems is certainly hardcoded and well beyond the scope of modding!
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