Get a computer with a gaugemode, and make sure it has the possibility to use a stopwatch with a secondcounter.
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If I were in your position, I would forget about all of this for now. Just go on diving with your Zoop and work on improving your skills. When you are ready for technical diving, research long and hard and then find the instructor and agency with which you want to do your training. Once you have done that, ask your instructor this question.
The odds are that your instructor will not have you using a computer for at least the earliest part of training. What happens after that really depends upon the instructor and agency:
- Some will never, ever want you to use a compute at all.
- Some will want you to preplan your dives using a software program and only use a computer for backup.
- Some will want you using the computer as your primary tool but having the software version on hand for backup.
I know instructors in all three camps.
You are probably years away from needing such a computer, so it makes no sense to me to purchase a computer now. If when you have gotten your training and decided a computer is the way to go, there will be new models available to you that don't even exist now, and your instructor may be able to get you a good deal on one.