Expect - 4 certification dives over a period of two days - and before a pool session so your certifier knows you actually took a course.
All skills can be asked for - and it is harder - depending on the waves / current / weather conditions, that certifying in a canal or quarry.
BUT you will be a better diver once you've passed this.
Like towing your buddy on the surface, using a compass on the surface & underwater. Plus the usual, like CESA, gear removal, etc.
With ocean dives, you have to deal with new things :
- deeper than a pool, knees on the sandy floor, upwards of 25 feet. About 50 for us last year.
- salt water that burns your eyes
- unbelievable visibility - seeing 100' or more
- using a boat
= boat -> loading your gear, installing your gear, you might get seasick, getting back in the boat
- learning how much weight you need
I'd say passing OW in a freshwater lake / canal / quarry, jumping from shore/dock, to be twice as easy as doing it in the ocean.
You benefit from a private guide - your instructor - for those first four salt water dives, thus creating life saving skills for you and your buddy. The downside is cost - it costs more money, as you are paying two instructors instead of one.
Remember - shore dives in ocean are fun - should you not like your boat experience.
I have completed the classroom & pool sessions for my PADI open water certification. Next I go to the ocean dives. Can you tell me if there are exercises to do underwater in the ocean, like we did in the pool, or are the ocean days really just do dive/swim around? Is it something that varies from company to company, or is there a set list of items to accomplish in the ocean like in the pool?