Oceanic ATOM Operating Manual - page 138

138

ALTITUDE SENSING AND ADJUSTMENT

Prior to the first dive of a series of repetitive dives, ALTITUDE (i.e., Ambient Pressure) is

measured upon activation of Dive Surface Mode and every 15 minutes until a dive is made

or operation reverts to Main Time after 2 hours.

>  While it is operating in Watch Modes after a dive, measurements are taken every 15

minutes during the 24 hour period after surfacing.

>  Measurements are only taken when the unit is dry.

>  Two readings are taken, the second reading 5 seconds after the first.  The readings

must be within 1 foot (30 cm) of each other to record that Ambient Pressure as the

current ALTITUDE.

The Mathematical Model in the ATOM accounts for the reduced No Decompression dive

Time available based on National Oceanic and Atmospheric Administration (NOAA)

guidelines.

When diving in high altitude waters from 2,000 to 14,000 feet (610 to 4,270 meters), the

ATOM automatically adjusts to these conditions providing corrected Depth, reduced No

Decompression Times, and reduced Oxygen Accumulation Times at intervals of 1,000 feet

(305 meters).

No adjustments are made during any time that the Wet Contacts are bridged.

At an elevation of 2,000 feet (610 meters), Depth Calibration automatically changes from

feet of seawater to feet of fresh water.  This is the first adjustment to the Algorithm.