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I was recently a new diver and rushed out and bought everything fairly recently before doing research (it's hard for me to try different types of gear so research is all i have). Based on my experience i would say get a Computer first, one that is nitrox compatible. The option is to rent from shop or use tables. Tables decrease your bottom time and renting doesn't give you dive history and could be inaccurate if the shop happens to give you a computer that was dived recently.
Hi Phoenix,
I have to respond to this, because it is such a pervasive belief with new divers, and I expect this has it's origins in the profit potential with dive shops...
It may well be that you live in a place, where a new diver can do such a multi level profile, that the tables will not leave them enough time to maximize enjoyment on a standard 2 tank boat trip. However, I have a hard time envisioning what the diving sites would be like, that would change the basic nature of novice diver potential so much...
In a place Like Palm Beach, we have vast dive site areas that are around 55 to 65 feet deep....often rising to 40 feet deep on top of a reef crown...and this is within swimming distance of the outside reef face, which will drop to around 95 feet deep. In other words, for a novice diver, this is the holy grail of multi-level profile diving,....a place where a dive computer has been promoted as being a big deal for them.
The problem, is that until a novice diver has had a few hundred dives, there is very little chance they can make more than 60 minutes on a tank of 34 % Nitrox, on a 60 foot reef. Many boats will give you this hour for the dive....your computer may give you alot more...especially if you spend some time up on the reef crown at 40 feet---BUT, the boat will only allow you 60 minutes. You are then going to have an hour surface interval, and then another Nitrox dive.....to 60 feet or less.
In Boynton Beach ( Palm Beach) where the reefs are this 55 up to 40 and swimming distance to 95( for start of dive if you want)....most novice divers are down to 1000 psi around 30 minutes into the dive...some sooner. This is the norm for most, until hundreds of dives are under their belt....Many never get any better with their breathing rate.
What they need, for the way boat dives work, is the Nitrox certification--which is so simple you would think it would be included in all entry level OW courses....but is a separate cert....cheap....and it should be mandatory to optimally enjoy boat diving....to not waste the standard 2 tank boat trip. This is a MUCH bigger deal than buying a computer, and trying to be an "air" diver.
Here is what the reefs look like, on a typical dive in Boynton .. it shows the multi-level potential of the reef and your dives well..
[video=youtube;s1kc13CBOGA]https://www.youtube.com/watch?v=s1kc13CBOGA&[/video]
My point is, you really would be wasting money on a dive computer until fairly far in to your diving experience....And..those of us that have been diving for many decades, really dont need them for most recreational dives with structured charter boat diving. It takes "special circumstances" to really need the expense.