My original Los Angeles County cert from the 60s allowed me to go to 130 ft. However, most of the young dive instructors and DMs I encountered while traveling had no clue about what the LAC cert meant (far more rigorous than most current agencies). I was asked to do too many damned "check out" dives by youngsters whose parents might not have been born when I started diving. When I got to the Great Barrier Reef in 2001, the instructor there nbot only knew what the LAC cert was, he referred to it as a "museum piece." He offered to give me a PADI AOW cert for the cost of the materials so I did it... but only so I could stop all the questioning. I did go on to get a PADI rescue cert. What was covered in PADI AOW and Rescue had mostly been covered in my three week LAC course back in the 60s (except for the new stuff).