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Instrumentation - Terminology

Dive Computer Terminology

Glossary of technical terms and common acronyms used for diving instrumentation

Acti (wet or button) Activates the computer when you get in contact with water or push the button to start the dive
Algorithm The Bühlmann decompression algorithm is a mathematical model (algorithm) of the way in which inert gases enter and leave the human body as ambient pressure changes
ALT adjustable Altitude adjustment for accurate calculation when diving at altitude
Ascent rate indicator Shows you the speed of the ascent of your dive
Audible alarm Acoustic signal for any pre-set parameters which are related to the safety of the diver
Backlight Illumination of the screen underwater
Battery power indicator Shows the current battery level
Bluetooth Smart Bluetooth Smart is a low energy wireless personal area network technology, that allows transmission between a dive computer and a mobile device
Bookmark Used to mark important points during the dive, which can be seen in the DiverLog program
Bourdon tube A mechanical device that measure pressure
Conservative factor adjustment When the Conservative Factor is set on, the no-decompression limit times are reduced to values equivalent to those that would be available at the next higher 3000 foot (915 meter) altitude
Declination adjustment Allows you to adjust your compass for ideal accuracy
Deep stop Deep stop is an extra voluntary safety stop at depth prior to the safety stop, which may be set by the diver
Depth alarm Will sound alarm once maximum depth, set by diver, is reached
Download Download updates or settings from DiverLog
Download cable Is the connection to your PC / Mac to upload or download your data
DTR alarm Dive Time Remaining alarm
EDT alarm Elapsed Dive Time alarm
Free dive Diving without dive cylinder to calculate and track Nitrogen Tissue Loading, allowing you to switch between SCUBA dives and Free Dives on the same dive day
FO2 Fraction of oxygen settings, FO2 is the fraction of oxygen in the mixture. For example, if a gas contains 36% oxygen (FO2 = 0.36)
Fresh / salt water select Ability to select water type, for accuracy of the algorithm’s calculation
Gas integration Contact with your first stage / tank which shows you how much gas you still have in your cylinder
Gas time remaining Calculation of timing remaining based on current depth and gas consumption rate
Gauge mode Divers using advanced breathing gases or diving beyond the limits of the dive computer may utilize the computer as an advanced digital depth gauge and bottom timer with detailed PC Interface
History mode Gives you a quick overview of important information from prior dives
Hoseless gas integration Eliminates the need of a traditional hose to provide your pressure information
LCD display A liquid crystal display (LCD) is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals (LCs)
Logbook A logbook is used to record the details of your dives
Max depth Deepest point during the dive
Max PO2 alarm Alarm sounds once max PO2 level is reached
Mounting option A different way of attaching the computer
Nitrox mode Specifically set to calculate based on your FO2
OLED display Organic Light Emitting Diode display is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current, resulting in a crisp,easy-to-read display
Plan mode Allows you to plan and preview your dive in advance
PO2 Partial pressure of oxygen. PO2 is a critical component of calculating your maximum oxygen saturation
Run timer Safety stops are considered mandatory by the majority of scuba training organizations for dives deeper than 100 feet or those approaching a no-decompression limit. While not strictly necessary, most dive agencies promote as safe diving practice
Set audible on/off Ability to turn the acoustic alarm on/off
Set deep stop on/off Deep stop is an extra voluntary safety stop in depth next to the mandatory stop in shallow water
Shortcut screen With a single press of the button, you will see all the main dive information for your logbook
TLBG alarm Tissue Loading Bar Graph alarm will sound when maximum rate, set by diver, is reached