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User settings on dive computers: reliability in aiding conservative diving.

Martin D J Sayer1,2, Elaine Azzopardi3,2, Arne Sieber4,5

  • 1UK National Facility for Scientific Diving hosted at the Scottish Association for Marine Science Laboratories, Scottish Association for Marine Science, Dunstaffnage Marine Laboratories, Dunbeg, Oban, Argyll PA37 1QA, Scotland, mdjs@sams.ac.uk.

Diving and Hyperbaric Medicine
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Summary

Divers can adjust dive computers for conservative dives, but results vary. Some settings are more conservative than enriched air nitrox (EANx), while others are less so, complicating dive planning.

Keywords:
Computers - divingaltitudedecompressionenriched air – nitroxpersistent (patent) foramen ovale (PFO)review articlesafety

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Area of Science:

  • Diving physiology
  • Scuba technology
  • Risk management in diving

Background:

  • Divers may adjust dive computers for conservative diving, especially with conditions like persistent (patent) foramen ovale.
  • Limited information exists on the effects of dive computer adjustments or comparisons with methods like enriched air nitrox (EANx).

Purpose of the Study:

  • To evaluate the impact of adjustable conservative settings on dive computers.
  • To compare the conservatism of modified dive computer settings with standard settings and enriched air nitrox (EANx).

Main Methods:

  • Seven dive computer models from four manufacturers were tested using various dive profiles (square-wave, multi-level, multi-dive).
  • Adjustable conservative settings were applied, and some modified profiles were compared against the use of EANx.
  • Testing included depths of 20, 30, and 40 metres' sea water (msw).

Main Results:

  • Conservative dive computer settings generally resulted in shorter dives or longer decompression obligations.
  • Some default computer settings were more conservative than modified ones.
  • Certain computer adjustments led to greater conservatism than EANx alone, particularly at lower partial pressures of oxygen (PO₂).
  • Some computers experienced 'lock out' during multi-dive series, while others reduced conservatism automatically.

Conclusions:

  • The variability in dive computer adjustments and responses makes conservative dive guidance challenging.
  • Enriched air nitrox (EANx) alone does not always ensure adequate conservatism.
  • Further research is needed to standardize and validate conservative dive computer settings.