Has anyone else been plagued by phantom smoke? On a couple of missions I have been followed by a mysterious smoke source.

After sailing a considerable distance from my last, sinking lo and behold there is this huge pall of smoke hanging in the sky. I know the Pacific is active volcanically but I don't think this was desiged into the program. It may explain why surface ships have been noticeable by their absence if I am followed by this all the time. Any ideas?