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Right after certifying OW (and loving it) my daughter and I purchased all of our own equipment. Instead of a SPG, we let a dive shop talk us into a wrist computer that was AI. We have two Aeris Epics that from what I read is suppose to be a great dive computer. We were told (and believed) that one of the advantages of having the AI system was to reduce drag of the SPG, thus not needing one. On a trip to Puerto Rico to do my AOW, I connected to an empty tank. My lack of understanding just how the Aeris Epic worked prevented me from checking my air supply on board prior to the dive and waiting until the wet activation kicked in (remember no SPG to check prior to the dive). Unfortunately, I had to leave the water and wait on the boat while everyone else dove. The next day I purchased a SPG Back-up and the extra drag has never been noticeable, but knowing the SPG was there has been a great comfort. On another trip to Thailand, we had battery issues and had a devil of a time finding replacements; Phuket is a dive town and there just about as many dive shops as there are 7-11s and 7-11s are every 100 meters on every street. Since we only get to dive about 20 dives per year; usually one or two trips per year, we have never gotten the full use out of the Aeris Epics. I also find the computer very difficult to use and need the manual to do the simplest functions; not the computers fault. For me, the Aeris Epic is just not user friendly for my old brain to remember everything and seems over complicated for our simple recreational diving. I truly do like having the computer on my wrist for convenience, but I also check my SPG about every third time I check my wrist. I am looking at the Galileo Sol, a bit over size but easy to operate (but again might be more computer than needed for simple recreational diving).
My recommendations are:
1) Buy what you think you will use for your style of diving, taking budget, frequency of use, technological literacy into account
2) Know how to work it before your dive not just the a quick vender demo
3) Have a contingency plan; recommend the SPG along with your computer of choice
4) Easy to replace the batteries (not factory battery replacement required)
Good luck.
Michael
The other moral of this story is to always turn your computer on and let it do its checks prior to jumping in, and look a the display. Don't rely on auto activation. It's too late by then. Also do other predive checks: which definitely includes checking your tank pressure and breathing from all your regs, also prior to jumping in. Jumping in before doing basic checks is a recipe for starring in the accident forum.
Adam
Also I might add, know everything about your dive computer before using it on a dive! I sat around the house playing with mine when I first got it until I figured it out .....
I agree 100%: read manual, take online class and take the dive computer for a virtual dive with our sim