As far as I know, it is also called Gato, which might cause some confusion.
It is referenced for example at http://floatingdrydock.com/Bu.htm, http://www.subnet.com/SHIPSTORE/buckle.htm, http://www.saundersinsignia.com/group157.html and http://www.subnet.com/fleet/ss212.htm
These are just a few sites returned by Google.
Greetings,
Jan Martin Wagenaar