…So I can do the AOW and include say the EAN then I only need 1 more EAN dive outside the AOW for the card…
PADI does not require any dives for Nitrox. Nor do several other agencies.
…How many dives are needed in each specialty…
The minimum number of scuba dives for PADI specialties include:
Zero dives:
Coral Reef Conservation
Digital Photographer (minimum one snorkel dive required)
Emergency Oxygen Provider
Equipment Specialist
Nitrox (2 dives optional)
Project AWARE
Two dives:
Altitude
Boat
Diver Propulsion Vehicle
Drift
Dry Suit
Fish Identification
Multilevel
National Geographic
Naturalist
Peak Performance Buoyancy
Photographer
Three dives:
Ice **
Navigator
Night
Rebreather **
Videographer
Four dives:
Cavern **
Deep *
Search and Recovery **
Wreck *
* Those marked with a single splat have a prerequisite cert of Adventure Diver (part way to Advanced).
** Those marked with a double splat have a prerequisite cert of Advanced Open Water Diver.
EDIT: PADI also has many more specialties. One category is "Standardized Distinctive Specialties". These include:
Zero Dives:
AED for Divers
Marine Life Injuries
Neurological Assessment
Sea Turtle Awareness – 2 snorkel or scuba dives
Whale Shark Awareness – 2 snorkel or scuba dives
2 dives:
Invasive Lionfish Tracker
3 dives:
Self Reliant Diver – prerequisite: Advanced Open water and 100 dives
Another category is "Distinctive Specialties" that an individual instructor prepares and gets approved by PADI. These include:
Touch the Sea®
Full Face mask
Coral Reef Ecology
Underwater Archeology
Vintage Diving
Diving History
and many dozens more. . .
And one more that used to be a standard specialty, but is no longer PC: Hunter
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