I have blanked the campaign files, and removed all manner of items from the mis file itself. It is a location thang, KM. This is the closest I have come to marking where it occurs, without fail, no matter the day, no matter the boat:
It crashed just after taking the screen shot. That is a 24nm circle I made there. If I come south toward the area, I can get the "Hold" to complete, but Attu itself will not let me near it. It doesn't matter if I'm in a Narwhal or a Gato or whatever... sigh. Building a completely new mis file and I'll try that.
Edit: New mission crashes also. It seems to be centered on Holtz Bay...