(NP (NP (NP (BASENP (DT A) (NN debris) (NN field)) (ADVP (BASENP (NN 4) (JJ nautical) (NNS miles)) (ADVP (RB south) (PP (IN of) (BASENP (DT the) (NN wreck)))))) (VP (VBN believed) (S (VP (TO to) (VP (VB be) (NP (BASENP (DT the) (NN site)) (PP (IN of) (BASENP (DT the) (NN battle))))))))) (PERIOD .))