Some practical advantageous for learning up the dive com (same applies for camera) before getting into the water:
- less workload/multitasking to 'do stuff', enjoy more, with less time figuring out things and possibly stressing out
>this often can snowball into more and more things, [e.g. beeping com when u just shot up the bag at s/stop then some current comes and your buddy gets swept off] the beeping or problem reading makes more panicky.
- u can proudly announce to your instructor about switching gas to nitrox mode when going for nitrox dive
- understanding ('dive education') what breaching NDL means - ie. since you comp is now beeping or warning, you've exceeded the limits due to excess nitrogen in the blood at depth. so? ascent immediately+signal the DM/buddy and go up as per ascent limits and watch your watch closely (er, but not too closely).
one (in my opinion) should avoid using a checklist to point out this is DCI, this is not DCI, etc.
- DCI is more complicated than it seems and ongoing research is still, ongoing. it's all about safety, understanding stuff to your limits and comfort of your holiday and others.
- promoting more dive education - heh heh, u should know never to miss deco stop, esp. if u made a v big breach in NDL, or doing multi day diving in LOB as your NTU is building up over the days (ie. you don't enter the water 'clean' becos of multi diving in 24 hr period). so how? emergency deco procedures can be read up, or, do a course of course..lol. perhaps to interest you, in relation to this could be learning/practice of a) dive com fail, or bottom timer or depth gauge fail scenario, b) breach NDL w/o suff. gas for completing deco, c) communication with surface support when in-water for a) and b), and d) incorrect gas setting for the dive you already in.
- DCI factors include many 'non-dive' things, such as hours of sleep, alcohol intake & time of last intake, food, hydration, diesel fumes, etc..a nice hot coffee/biscuit combo after going down always perks you up