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1. Don't trust electronics (they will fail at some point, guaranteed).
So will mechanical devices. This means that bottom timers (which are almost all electronic these days) and depth gauges don't get a pass when talking about the use of tables for diving.
2. Every diver should know what to do when electronics fail, so repetitive use of tables and standardising of gasses means knowing what deco you need from memory for every dive.
We're talking about recreational level diving, not diving that requires decompression stops. The bail-out procedures for gauge/computer failure for recreational diving is still taught and students are expected to demonstrate knowledge of that procedure prior to certification.
3. Planning a dive effectively, with your buddy or team, means that you can plan for contingencies together.
Again, recreational contingencies around equipment failures are standard and extensively emphasized in classroom, pool and open water.
4. Dive planning and the correct use of tables is essential for any diver moving towards use of Nitrox or multi-level diving, in order to understand all the issues with oxygen and inert gas tracking, which is crucial for repetitive diving such as on a liveaboard trip.
Not really. Deco for Divers doesn't use tables and I learned more about the subject from that than I ever did from my TDI books and associated tables.
Training should not be solely about making money from the diving community; it should be about fully equipping divers for their diving career.
I'm not aware of a single instructor on this board that disagrees with that statement or fails to live up to the sentiment behind it.