User`s guide

15

WARNING
This option is intended only for highly
experienced divers. Users who clear the
residual nitrogen memory cannot then
use the instrument for repetitive dives.
After this operation, do not dive with Nemo
Excel if you have already dived within the
previous 24 hours.
PLAN
SCROLLING OF NO
DECOMPRESSION LIMITS
This function allows the user to scroll through
the no decompression limits, automatically
taking into account the current residual
saturation of the tissue compartments from a
preceding dive.
The times shown during the scrolling of no
decompression limits take into account all
the Set Dive parameters, such as the Mode,
Altitude, Personal Correction Factor and, in
the case of Nitrox dives, the values for oxygen
percentage and its maximum permitted partial
pressure (fig. 41).
Fig. 41
To enter Plan Mode, scroll through the Dive
Menu until the “PLANNING” message appears
on the display bar, and then press the <enter>
button.
Repeatedly press the <+> button to increase
the depth by three meters each time, up to
a maximum of 48 m (157 ft). For each depth,
the display shows the corresponding no
decompression time expressed in minutes.
If “Nitrox” mode is selected, the display also
shows the programmed value of oxygen
percentage. The maximum depth allowed in
this case varies as a function of the % O
2
and
maximum PPO
2
that have been entered.
NOTE
The Plan function will only be active after
having selected AIR or EAN mode in Set
Dive.
•
FREE DIVE
Nemo Excel is a truly versatile dive computer,
that you can also use for breath-hold dives
(freediving).
Due to the peculiarities of freediving, and of
Nemo Excel’s specific functions for this activity,
all the pertinent operations are discussed
separately, in this section. We will first look
at the settings, and then at the Nemo Excel
displays in freedive mode.
Nemo Excel organizes the dives by “days”
or sessions, to help freedivers optimally
manage their training. The following diagram
summarizes how Nemo Excel manages the
details and alarms (fig. 42).
Fig. 42

WARNING
The practice of freediving exposes divers
to different hazards from those associated
with Scuba diving. The diver should be
aware of these risks and understand how
to avoid them.

WARNING
Do not practice freediving immediately
after a compressed air or Nitrox dive.
NOTE
Press and hold down the button + for
2 seconds to activate the display backlight.
SET DIVE  MODE
Also for freediving, the first step is to set up
the general dive parameters.
These parameters are entered from the Set
Dive - Mode menu.
FREE DIVE
The parameters which can be programmed for
freediving are:
• activation of alarms;
• maximum dive time;
• maximum depth;
• surface time;
• depth intervals.
SET FREE  ALARMS ON/OFF
This parameter enables (“ON”) or disables
(“OFF”) all the alarms. The alarms must be
enabled before they can be configured (fig. 43).
•
Fig. 43
NOTE
In Free Dive Mode, this icon
indicates that the alarms are
enabled.
The parameters which can be programmed for
freediving are:
• maximum dive time;
• maximum depth;
• surface time;
• depth intervals.
SET FREE  MAX DIVE TIME
This alarm monitors the maximum duration of
the dive. If enabled, Nemo Excel will sound an
audible alarm when the dive time exceeds the
programmed limit; the Dive Time indication on
the display will start to blink.
SET FREE  MAX DEPTH
This alarm monitors the maximum depth of
the dive. If enabled, Nemo Excel will sound
an audible alarm when the depth exceeds the
programmed limit; the depth indication on the
display will start to blink.
SET FREE  SURFACE TIME FIG 44
Fig. 44
This alarm monitors the surface time. If
enabled, Nemo Excel will sound an audible
alarm when the surf time exceeds the
programmed limit; the Surf Time indication on
the display will start to blink.