The Recreational Scuba Training Council (RSTC) has this one : Common Hand Signals for Recreational Scuba Diving
[url]http://es.scribd.com/doc/6492155/Common-Hand-Signals-for-Scuba-Diving[/URL]
[url]http://es.scribd.com/doc/6492155/Common-Hand-Signals-for-Scuba-Diving[/URL]