[bang-on]

in many circumstances i would agree with a call to bin a dive if a primary piece of kit goes pear shaped.
however murphy's law states if kit is going down its normally at the worst possible time ie; when you have just completed your bottom time and are leaving the bottom,back up for this information is fairly critical especially on deeper longer dives that require long deco and many gas changers.
that said never had a computer fail in water yet.
cheers
barrie