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DIVE COMPUTERS 101

DIVE COMPUTERS 101

•Dive Computers 101 is designed to provide

divers with the theory, operation and benefits of

multilevel diving with Oceanic Dive Computers.

•OBJECTIVES:

•Have A basic understanding of how Dive Computers

work

•Understand the advantages of Dive Computers vs. dive

tables

•Understand the pre-dive setup, planning, underwater

operation and post-dive features of a Dive Computer

•Determine which Dive Computer features will best suit

your type of diving

HOW A DIVE COMPUTER WORKS

HOW A DIVE COMPUTER WORKS

•Sensors send data to the

Analog to Digital (A/D)

Converter.

•A/D Converter changes

analog data to digital

signals.

•The Micro Processor

calculates the data and

presents it to the diver via

the LCD Display.

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

•When using basic dive tables, the profile is

based on the maximum depth reached for the

total time of the dive. As a example: a diver

performs a dive for a total time of 24 minutes

and the deepest part of the dive was 88 feet. On

every recreational dive table the depth will be

rounded up to the next highest, in this case 90

feet. Even if the diver only spent 2 minutes of

their dive at 88 feet and the rest of their dive at

30 feet the entire profile charts at 90 feet on a

dive table.

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

•Diving Computers calculate a more accurate

profile. They use the same (or similar) algorithms

as the tables and simply perform those same

calculations several times a second. Going back

to the previous example, a Dive Computer would

take into account that only 2 minutes were spent

a 88 feet. It adjusts the no decompression dive

time remaining, thus allowing additional bottom

time.

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

COMPUTERS vs. TABLES

•When used properly, diving computers are very

safe. Because they automatically read the exact

depth and duration at every point of the dive

they can potentially reduce diver error. They also

automatically time surface intervals as soon as a

diver surfaces. Again, providing more accurate

information which can benefit on repetitive dives.

Over the course of a dive vacation a computer

can safely add hours of available bottom time.

DIVE COMPUTER THEORY

DIVE COMPUTER THEORY

•OBJECTIVES:

•Have A basic understanding of the Decompression

Model utilized by Oceanic Dive Computers

•Have a basic understanding of Tissue Compartments

and how they are graphically represented on an

Oceanic Dive Computer

DECOMPRESSION MODEL

DECOMPRESSION MODEL

•Decompression theory can be trusted only as far as it

has been demonstrated by actual test dive data. In

1987 Diving Science and Technology (DSAT)

conducted a unique series of experiments.

Commissioned by the Professional Association of

Diving Instructors (PADI), these Doppler ultrasound

monitored human experiments conducted by Dr.

Michael Powell produced the most comprehensive

data set that exists for recreational divers to this day.

These data were used to validate the PADI

Recreational Dive Planner and are the basis of the

algorithm used in all Oceanic Personal Dive

Computers (PDCs).