This is really cool, nice work!<p>I knew U-boats operated off the Eastern US coast but I did not know they operated so much in the Gulf of Mexico and the Caribbean.<p>Tangential, I've been watching this documentary series called Battlefield (highly recommended) <a href="https://www.youtube.com/watch?v=21qqkC1cWvE" rel="nofollow">https://www.youtube.com/watch?v=21qqkC1cWvE</a> and they mention later versions of U-boats had a 12,000+ mile range. So the Gulf of Mexico is within range especially if they sortied from France.