Main Menu
Join Undercurrent on Facebook

The Private, Exclusive Guide for Serious Divers Since 1975 | |
For Divers since 1975
The Private, Exclusive Guide for Serious Divers Since 1975
Join Undercurrent on Facebook
"Best of the Web: scuba tips no other
source dares to publish" -- Forbes
May 2013    Download the Entire Issue (PDF) Vol. 28, No. 5   RSS Feed for Undercurrent Issues
What's this?

Is Your Dive Computer Correct?

for depth and temperature, it may not be so accurate

from the May, 2013 issue of Undercurrent   Subscribe Now

Subscriber Content Preview
Only active subscribers can view the whole article here

Your diving computer monitors and calculates your decompression schedule for each dive, based on continuous measurement and recording of pressure and time, and the depth displayed on your computer is an interpretation of the pressure measured. In the past, studies have discussed how the conversion of a pressure-to-depth estimate can be affected by environmental factors, like altitude. But what about factors like temperature and salinity?

The European standard used in many dive computers largely overlooks the fact that total accuracy with regard to depth can only be achieved through converting pressure readings in a combination of measured physical parameters, mostly water density and temperature. Only Cochran computers are capable of automatically adjusting for salinity changes. Most dive computers don't have that capability -- they have assumed calibrations for water density built in, letting the user switch between "freshwater" or "seawater." And almost no manuals don't explain their assumptions for pressure-todepth conversions.

Elaine Azzopardi and Martin Sayer of the UK National Facility for Scientific Diving in Scotland wanted to investigate how dive computers display depth when exposed to a number of pressures, and when set to seawater and freshwater modes at typical densities in both water types. Many computers also display water temperature, so those recordings were also studied....

Subscribers: Read the full article here

Want to get more articles like these and
other important scuba updates sent monthly to your email?
And a FREE Recent Issue of Undercurrent

Free Undercurrent Issue
Get our free monthly Online Update, and a sample issue!



I want to get all the stories! Tell me how I can become an Undercurrent Online Member and get online access to all the articles of Undercurrent as well as thousands of first hand reports on dive operations world-wide

NEW! Find in  

| Home | Online Members Area | My Account |
| Travel Index | Dive Gear Index | Health/Safety Index | Environment & Misc. Index | Seasonal Planner | Forums | Blogs | Free Articles | Book Picks | News |
| Dive Resort & Liveaboard Reviews | Featured Reports | Recent Issues | Back Issues | Login | Join | Special Offers | RSS | FAQ | About Us | Contact Us | Links |

Copyright © 1996-2016 Undercurrent (
3020 Bridgeway, Ste 102, Sausalito, Ca 94965
All rights reserved.