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This earlier post explains my point of view:
I have written about this often--there are dives where you don't need any instrumentation--no need for computers, SPGs, depth gauges, or timing devices. As dives get deeper, your needs increase.In theory, a computer will give you more time if you spend most of your time shallower than the maximum depth, but at the depths you are talking about, it probably won't make much difference. Using the PADI tables, your maximum bottom time for a first dive to 18 meters would be 55 minutes, and if you stayed out of the water for 3 hours, a second dive to the same depth would be 49 minutes. If you are not going to exceed those times, you barely need the tables.
A reg is essential for me I draw the line at "feathering" a valve while trying to breath from it. So judging by your last post a tank is essential or is a long hose is all you'll be needing?All you really need is a source of compressed air, even a regulator is somewhat optional.
But still diving which was the question wasn't it? Is a PDC essential for diving?if you went to Truk, and your computer didn't work, would it impact your trip adversely?
Would you be happy cutting your dives short compared with everyone else, who is diving on computer?
The first time I went to the Red Sea on a live aboard. I borrowed a Suunto Solution, (which was worth more than my new drysuit!) If I hadn't had the computer, and had relied on tables, by day three I would have had to miss at least every other dive to get back on the tables!
If you are diving once a year adding a day or two diving to your holiday, then a computer doesn't make economic sense (nor does buying reg's bcd etc). If you are diving regularly, its uneconomic not to have a computer.