The magnetic anomaly is of little importance in this game/simulation. The boats in those times made use of gyro-compasses which aligned themselves to the poles of earth rotation by precession. Mere mechanical disturbances nudging it around. Not at all by magnetic torque. So modelling it seems redundant. Aside from that, there are many bugs that they had better had put their time on squashing them.
If you want to reduce errors when working with the 4-bearing method then I suggest you increase the time interval to than a halve hour. Or whatever makes the bearing drift 5 degrees to begin with. Unless you use the periscope for bearings the bearing-error isn't likely to be much smaller than a degree.
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