For some reason, one of my pirates won't properly target subs. It never let's me actually lock onto the sub, although the pirate will ultimately target the sub, but then the trajectory is an arc rather than a straight line. This causes the pirate to miss the sub and turn around. Strangely, my other pirate works just fine. I have a video of the behavior, but it doesn't seem like I can attach it here. If anyone has a tip how to post the video, let me know! Hoping someone can help with my dud pirate!
http://youtu.be/E-fL9kX7Hok
Edit: Added YouTube link to the video