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You guys could try being positive some time. Instead of flaming everyone give them a way to be happy and yet still be safe. I thought I did this in my post by recommending his father do a Discover Scuba Diving. The OP gets to dive with his dad, the dad gets to dive without a lot of investment. Everyone is safe. Problem solved.
Ok, so I'll say it again.
The OP says he just recieved his cert. We must presume it was with a bad instructor, right? So I infer from your post that it is ok for him and his dad to stumble around at some unnamed place with SCUBA.
I don't recall that the OP had any special "knowledge of being in the water" other than his certification by what we must assume is a bad instructor.
I would hazard a guess that a even a bad instructor has more knowledge in this respect than the OP.
Hey... rocket science can be accomplished without formal training. Instructors are not magicians, some think they are teaching, how many times it is the student the one learning (in spite of the instructors) you see that in our Colleges and Universities every day.
Is it easier to go to a dive shop and get your XXXX certification? Sure it is. But it is not the only way. That is my point, I didn't explain better earlier.