The easiest way would be tu use DIRUSE.EXE from the Windows Resource Kit.

And the the following posts:
http://81.17.37.55/board/ultimatebb.php?ubb=get_topic;f=1;t=001657
http://81.17.37.55/board/ultimatebb.php?ubb=get_topic;f=1;t=002315
http://81.17.37.55/board/ultimatebb.php?ubb=get_topic;f=1;t=002771
http://81.17.37.55/board/ultimatebb.php?ubb=get_topic;f=2;t=000778

they are all variations of the same problem. you couild also type DIRUSE into the BBS search and find a couple more posts.
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There are two types of vessels, submarines and targets.