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EXPLANATION OF THE TERMS
ExplanationTerms
No-de-
compression
limit (NDL)
The maximum time during which the diver
can stay at the current depth or in the selected
depth rank without decompression
procedure. The watch indicates NDL up to
200 minutes.
In the DIVE PLAN display, if you choose a
depth rank where the partial pressure of
oxygen exceeds 1.6, “– –” is displayed in
place of NDL.
The pressure sensor measures the
atmospheric pressure at regular intervals,
and the watch indicates the altitude rank in
four levels from 0 to 3. The measurable
range of altitude is 0 ~ 6,000 m (19,700 ft). If
the measurement is outside this range, the
altitude rank indicator flashes.
Terms Explanation
Altitude
rank
The amount of nitrogen absorbed by the
diver’s body is indicated graphically in 10
levels from 0 to 9 by the number of bars
shown on the display. When all 9 indicator
bars light up, the watch calculates
decompression diving.
Residual
nitrogen
indicator
The time required for the excess amount of
nitrogen accumulated in the diver’s body
during a dive to be eliminated completely. It
is indicated in hours and minutes, and the
watch counts it down. Desaturation is
considered to be completed when the
countdown is over.
Desaturation
time
FO2
(Percentage
of Oxygen)
The percentage of oxygen in the gas mixture
of the scuba tank, which the diver needs to
set for the watch before diving. For diving
with air, “Air” (21%) should be set. FO
2 can
be set from 22% to 50%, and if a value within
this range is set, the watch calculates nitrox
diving, and the nitrox mark “Nx” is shown
on the display. The set FO
2 is recorded in the
dive log function.
If the watch is left untouched with “Nx”
shown on the display after a dive, it starts
flashing on the next day to indicate that FO
2
should be re-set. Otherwise, “– –” is shown
in place of the previous FO
2 setting, and the
watch cannot be used for diving.
Nitrox
mark
Depth rank
For planning a dive, the depths from 9 m to
48 m (30 ft to 160 ft) are divided into 14 ranks
in 3 m (10 ft) increments.
The order of diving data stored in memory.
Details of up to 30 dives can be recorded.
The log data of a dive is shown in two
separate displays. They have different log
Nos. such as “30-1” and “30-2”.
Log No.
The number of dives made on the same day.
It is recorded in the dive log function.
Number of
dives on
that day
The time when the dive is started. The watch
records the time when the diver descends to
a depth of more than 1.5 m (5 ft).
Entry time
Exit time
The time when the dive is finished. It
corresponds to the hour and minute when
the diver ascends to less than 1.5 m (5 ft)
underwater.
The average depth is calculated from the
depth data measured during a dive. It can be
checked in the dive log function.
Average
depth
The greatest measurement of depth during
a dive.
Maximum
depth