Editing Dive computer (section)

=== Redundancy ===
A single computer shared between divers cannot accurately record the dive profile of the second diver, and therefore their decompression status will be unreliable and probably inaccurate. In the event of computer malfunction during a dive, the buddy's computer record may be the best available estimate of decompression status, and has been used as a guide for decompression in emergencies. Further diving after an ascent in these conditions exposes the diver to an unknown additional risk. Some divers carry a backup computer to allow for this possibility. The backup computer will carry the full recent pressure exposure history, and continued diving after a malfunction of one computer will not affect risk provided that the second computer continues to function correctly. It is also possible to set the conservatism on the backup computer to allow for the fastest acceptable ascent in case of an emergency, with the primary computer set for the diver's preferred risk level if this feature is not available on the computer. Under normal circumstances the primary computer will be used to control the ascent.<ref name="Tek lite 1" />
<ref name="Davis redundant computers" />