User`s guide

11
<-> button:
• is used for changing the information shown
on the display bar.
<enter> button:
• temporarily displays (for 10 seconds) the
dive parameter settings, just as they appear
in Predive Mode.
<esc> button:
• this button is disabled during the dive.

WARNING
Continual use of the backlight drastically
reduces the battery life.
NOTE
When the no decompression time
remaining is one minute, an audible alarm
is sounded to indicate that the diver is
about to exceed the no-decompression
limits.
DIVE  AIR
“DECOMPRESSION STOP” DIVE
If the diver does not ascend when the above
alarm is sounded, Nemo Excel begins
calculating a “decompression stop” dive,
indicated by the appearance of the “deco”
message and by an audible alarm. The
following data are displayed in this mode
(fig. 29):
Fig. 29
• “deco” icon;
• current depth (in “m” or “ft”);
• depth of deepest decompression stop (in
“m” or “ft”);
• duration of the deepest decompression stop;
• duration of the dive so far, in minutes, shown
in analog form around the perimeter of the
dial;
• icons for the altitude program and personal
correction factor (if enabled).
On the display bar it is possible to view one of
the following
• the ascent time, i.e. the total time necessary
for surfacing;
• the temperature (in °C or in °F).
Or
• the ascent time;
• the duration of the dive so far (dive time) in
digits.
Or
• the ascent time;
• the primary time.
The buttons have the same functions
described in the preceding section on “No-
decompression diving”.
TIME TO SURFACE ASC TIME
The Ascent time is given by the sum of:
• duration of the various decompression
stops;
• time required to ascend at an average speed
of 10 m/min (32 ft/min).
• any deep stops.
DECOMPRESSION STOPS
Nemo Excel will also check that the
decompression stops have been observed; two
icons graphically indicate what action the diver
should take.
• 2 triangles: correct decompression stop
depth;
• upward triangle: diver below decompression
stop depth, ascend!
• downward triangle: diver has ascended
beyond decompression stop depth, descend!
If the decompression stop depth is exceeded by
more than 30 cm (11 inches), the “downward
triangle” icon will flash; if it exceeds 1m (3 ft)
it keeps flashing and an audible alarm will
sound. These warnings remain active until the
diver returns to the correct depth.

WARNING
Never ascend above the correct
decompression stop depth.

WARNING
When the omitted deco stop alarms are
triggered, desaturation of the simulated
tissue compartments is halted and
resumes only when the diver returns to the
correct stop depth.
NOTE
If the deco-stop overshoot exceeds one
meter and lasts more than three minutes,
the computer switches to “Omitted Stop”
mode and the corresponding icon appears.
In this case, if after surfacing the diver
attempts a repetitive dive, Nemo Excel will
function only as a depth gauge and timer
(BT mode), and display the errors of the
preceding dive.
DEEP STOPS
NOTE
During the dive, when the conditions exist,
Nemo Excel will display a “deep” icon. This
display is helpful in planning the deep stop
during the ascent.
NOTE
When the <ESC> button is pressed during
the dive, Nemo Excel will temporarily
display the estimated deep stop required.
The data displayed during the ascent may
vary as a result of the diver’s behavior.
Divers should check this data during the
ascent for more precise information on the
estimated stop.

WARNING
A rapid ascent increases the risk of
decompression sickness (DCS).
To minimize the likelihood of critical bubble
seed formation, in case of decompression
dives or dives close to the no-deco limit, Nemo
Excel prompts for a series of one-minute deep
stops at different depths depending on the
dive profile. When the diver approaches a deep
stop, Nemo Excel sounds an audible alarm
and the “DEEPSTOP” message appears on the
display bar.
There can be more than one deep stop during
a dive. This depends on the dive profile and on
the type of decompression (fig. 30).
Fig. 30
NOTE
For more information about the RGBM
Mares-Wienke algorithm, visit the website:
www.rgbm.mares.com
NOTE
The audible signals for any deep stops are
always enabled.
ASCENT
A reduction in depth activates an algorithm for
monitoring the ascent rate, which is shown both
in m/min (fit/min) and graphically, as illustrated
in the figure. If the diver’s speed exceeds 12 m/
min (39 fit/min), the “Slow” message appears
on the display bar and Nemo Excel sounds an
audible alarm, which persists until the ascent
rate returns below the maximum permitted
limit (12 m/min - 39 ft/min).
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