poko21
Registered
do any dive shops require advance open water cert to go on certain dives or is open water sufficient? I've had open water for the past 20 years is there a reason to go for advance open water or are other certs more useful?
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Often due to insurance requirements, many dive shops/dive ops require AOW certification for divers to participate in dives that go deeper than the training limits established for OW courses of instruction (18M/60FT).
Because of the above insurance imposed depth restriction, it is often recommended that one obtain their AOW as it often includes instruction/experience for deeper diving down to between 30M/100FT and the recreational limit of 40M/132FT (depending on the agency).
AOW certification coupled with Nitrox certification will usually be enough to participate in most dives offered by shops/commercial diver operations. The exception being dives that penetrate wrecks, canyons, and caves. Shops/commercial dive operations also typically require a diver to posses Drysuit certification before they will rent one a drysuit.
If the shops/operations you dive with are ok with you accompanying them past whatever depth, or you are happy to dive with a commercial operation and be limited to depth based on your OW certification, then no worries....the AOW certification just opens up the possibility to dive with a commerial operation if you dive with a shop/operation not familiar with your experience or that require the additional certification level for the dives they schedule.
Hope that helps.
-Z