| Well, a back-up in the form of a D-timer lets you head up safely, using depth and ascent rate guides, and complete a sensible stop.
When diving with deco obligations taking a set of back-up tables means if your computer (if you were diving off of that, of course) goes kaputt you can complete deco safely using only the d-timer.
So, a back-up computer at £300 or more, or a D-timer at £60 doesn't seem much of a battle to me! |