The NATGEO course is a co branded course offered by PADI.
It was introduced a couple of years ago as a way to market to new divers.
It combined the standard open water course plus additional focus on the environment. The National Geographic Open Water Course, allows new divers to enter the sport, work on additional Buoyancy and Navigation as well as do an exploration project. Regardless of what you think of PADI, if adopted by the shops and supported by National Geographic, it could have advanced diving signficantly. However, in my opinion, neither group has done a whole lot with it.
NATGEO is also a specialty. It has some buoyancy and navigation skills in it. But they are not much more than what is offered in PADI's OW Course. The focus of the specialty course is really on the dive environment and the exploration project.
These options include:
1. Sketch a feature or defined area of a dive site on a slate – coral head or reef, artificial structure, wreck, rock formation, etc.
2. Survey an area noting all unnatural disturbances (anchor damage, etc.) as
well as the location and type of garbage to create a graphic environmental
assessment. (Be sure to remove trash as appropriate.)
3. Conduct a fish (invertebrate, mammal, creature) count over a specified area
and create a graph showing the numbers and types of species observed.
4. Place a grid over an area (wreck, reef, rock formation, etc.) and assign divers
to sketch/photograph specific squares. Encourage divers to note details about
the creatures and objects in their assigned area on their slate.
5. Map a defined area on a slate – recording depth, measuring object placement
and recording aquatic life found.
6. Using a depth gauge and thermometer, take and record temperature readings from the surface down to depth at various locations of a dive site to create
a graph charting changes. (Must be a dive site where temperature varies
enough to be interesting.)
7. Photograph all aspects of a defined area from surface
to bottom and side to side to create a photo collage.
8. Photograph the same area (fairly active part of the
dive site) over a specified time to create a photo-essay
showing changes in creature behavior and movement.
9. Photograph as many different species of aquatic
life as possible at the site and create a photo-essay
describing the area’s biodiversity.
10. Photograph as many different individuals of one species
(fish, shells, shrimp, crabs, coral, plants, etc.) as
possible at the site and create a photo-essay pointing
out physical, behavioral, and habitat differences.
11. Photograph all unnatural disturbances (anchor damage,
etc.) as well as the location and type of garbage
to create a graphic environmental
assessment.
12. Videotape all aspects of a defined area from surface to
bottom and side to side, then edit into a complete tour
of the site.
13. Videotape an area (fairly active part of the dive site) and identify the
creatures. Describe their behavior and movement.
14. Videotape as many different species of aquatic life as possible at the site and
create a video showing behavior, interaction, and the area’s
biodiversity.
15. Videotape as many different individuals of one species (fish, shells, shrimp,
coral, plants, etc.) as possible at the site and describe the physical,
behavioral, and habitat differences.
16. Script and shoot a video following a diver around a dive site pointing out key
features and interacting appropriately with creatures and structures.
If you are interested in getting a sampling of navigation, buoyancy and environment, this is a nice intro to all of those (this also assumes your instructor knows what he/she is doing). If you are looking at improving your navigation and buoyancy, I would consider one of the direct specialties for enhancing those skillsets. The nav and buoyancy skills are very basic in this course.
As for environmental studies: This course isn't bad. However, you may also want to look at courses by Beautiful Oceans as well. Also, PADI has some decent material for their Coral Reef Awareness course.
To my understanding, only National Geographic Dive Centers can issue the NATGEO Specialty or OW Certification. I believe only 5 star facilities can apply to be a NATGEO Center.
Good luck, dive safe.
JcF