Cressi NEPTO User manual
LONG LIFE
BATTERY
HIGH CONTRAST
DISPLAY
EASY ACCESS
MENU
WIDE DIAMETER
INSTRUCTION
MANUAL
NEPTO
ENGLISH
2
Congratulations on your purchase of your NEPTO dive computer, a sophisticated
and complete instrument, made to guarantee you the utmost safety, efficiency,
and reliability.
MAIN SPECIFICATIONS.
WATCH
• 12/24 clock with minutes and seconds
• Calendar
• Precision stopwatch
• Timer
• Tide indicator
• Second time setting
• Alarm clock
DIVE COMPUTER
FREEDIVE FUNCTION
• Proprietary Cressi algorithm developed entirely in our laboratories, exclusively
for freediving
• Full setting of alarm parameters for time and depth
• Visual and audible alarms
• Audible alarms can be enabled or disabled.
• Fresh/saltwater setting
• Option to set the sampling time for the dive profile
• Users can switch the units of measure between metric (meters and °C) and
Imperial (ft and °F).
• PC/Mac/iOS/Android interface with general data and dive profile
(optional)
GENERAL WARNINGS AND SAFETY RULES
IMPORTANT: please read the instructions! Read this instruction manual
carefully, including the sections on safety rules. Make sure that you have fully
understood the use, functions, and limits of your device before using it! Do
NOT use the device until you have read this instruction manual in its entirety.
IMPORTANT: this device must be considered a aid to your dive, and does not
replace the use of dive tables.
IDANGER: NO DIVE COMPUTER CAN EVER FULLY PROTECT AGAINST
THE RISK OF DECOMPRESSION SICKNESS (EMBOLISM). IT MUST BE
CLEAR THAT AN UNDERWATER DIVING COMPUTER CAN NEVER COM-
PLETELY ELIMINATE THE RISK OF DECOMPRESSION SICKNESS. A COM-
PUTER CANNOT TAKE INTO ACCOUNT A DIVER'S PHYSICAL CONDITION,
WHICH MAY VARY DAILY. WE THEREFORE RECOMMEND THAT YOU HAVE
A THOROUGH MEDICAL EXAM BEFORE YOU BEGIN DIVING, AND THAT
YOU ASSESS YOUR OWN PHYSICAL CONDITION BEFORE EACH DIVE.
IT'S IMPORTANT TO KEEP IN MIND THAT CIRCUMSTANCES THAT CAN IN-
CREASE THE RISK OF DECOMPRESSION SICKNESS CAN ALSO DEPEND
ON EXPOSURE TO THE COLD (TEMPERATURES LOWER THAN 10° C),
SUB-OPTIOMAL PHYSICAL CONDITION, MULTIPLE SUCCESSIVE DIVES
OR DIVES ON CONSECUTIVE DAYS, DIVER FATIGUE, CONSUMPTION OF
ALCOHOL, DRUGS, OR MEDICATION, AND DEHYDRATION. AVOID THESE
SITUATIONS AND ANY OTHERS THAT MAY COMPROMISE YOUR SAFE-
TY: EVERY DIVER MUST BE RESPONSIBLE FOR THEIR OWN SAFETY.
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IMPORTANT: only certified divers should use this device. No computer can
replace proper dive training. Remember that only adequate training can ensure
a safe dive.
IMPORTANT: The NEPTO computer by Cressi is designed for recreational
diving only. It is not intended for commercial or professional use, as these
activities entail longer dive times and greater depths, with a resulting increase
in the risk of decompression sickness.
IMPORTANT: Before using the computer, make some preliminary checks on
battery life and the indications on the display. DO NOT dive if these indications
are at all unclear or dimmed, or if the low battery icon appears.
IDANGER: WAIT FOR THE "NO FLY" INDICATION ON THE DISPLAY TO
TURN OFF BEFORE YOU FLY.
IMPORTANT: This device is intended for use by one person. The information
it provides refers only to the person who has used it during the dive or during
a series of repeated dives.
WARNING: Check the parameter settings on your device before diving.
IMPORTANT: Avoid all dives with high-risk profiles, because they are poten-
tially dangerous and place you at an elevated risk of decompression sickness.
FREEDIVES
WARNING: Freediving safety depends on the rational abilities of each person
to use their theoretical and practical knowledge sensibly and prudently to avoid
accidents. This device must only be considered a freediving aid for people who
have diligently prepared for the risks that this activity entails. Therefore it must
only be used by divers who are fully trained in both the theory and practice of
freediving techniques and the dangers that it entails.
IDANGER: IT MUST BE CLEAR THAT A DIVE COMPUTER CANNOT, AND
IS NOT INTENDED TO, ELIMINATE THE RISK OF SYNCOPE OR TARAVANA.
A DIVE COMPUTER ONLY INDICATES DIVE TIME, SURFACE TIMES, AND
DEPTH. THE INFORMATION PROVIDED TO THE DIVER IS MERELY DATA, AND
IT BECOMES SAFETY INFORMATION ONLY ONCE IT HAS BEEN EXAMINED
AND PROCESSED BY THE HUMAN MIND. THEREFORE, SOLID AND THOR-
OUGH THEORETICAL PREPARATION IS RECOMMENDED.
WARNING: Only certified divers should use this device. No computer can
replace proper dive training. Remember that only adequate training can ensure
a safe freedive.
WARNING: The Cressi NEPTO computer was made solely for recreational
use and it is not intended to be used professionally.
IDANGER: It is crucial that you do not take any demanding freedives at
a sustained pace in the 48 hours before flying or traveling to high altitudes.
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WARNING: Deep freediving is a dangerous discipline, and a great deal of
practical and theoretical preparation is necessary in order to practice it safely. It
is important to earn a certification from an accredited dive school. In any case,
we recommend that divers always be fully aware of their limits and remain well
within them when practicing this discipline. We recommend that you never dive
alone, and that you are always with a buddy who is ready to help if needed.
WARNING: Currently there is no corroborated scientific literature with a full
understanding of what causes Taravana. This means that it's important to your
health to avoid deep freedives at a sustained pace for many hours with only
brief surface intervals. Do not dive if you are not in perfectly normal health, and
make sure you stay hydrated and maintain a regular energy intake.
NOTE: when you fly, carry the device in the pressurized cabin with you.
Cressi reserves the right to modify the instrument without advance notice in
accordance with continuing technological updates to its components.
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INTRODUCTION
It is very important to read this instruction manual carefully and understand its
instructions exactly. Failure to do so can result in serious harm to your health. The
purpose of this manual is to guide the buyer in understanding all the functions of
the computer before using it on a dive.
COMPUTER CONTROL
HOW THE NEPTO COMPUTER-WATCH WORKS
Watch function
NEPTO features an intuitive circular menu with multiple levels.
Functions of the buttons
UP Button /
SEL
: short-press this button to scroll through the various menus
and adjust increments upward. Long-press this button to enter the various menus
and confirm selections.
When long-pressed in the time, stopwatch, or dive functions, this button turns on
the backlight.
DOWN Button /
ESC
: short-press this button to scroll through the various
menus and adjust increments downward.
Long-press the button to exit the various menus.
Long-pressing this button on the surface during the dive will exit the freedive
session.
SCROLL DOWN (short press)
• decrease one step
SEL
SEL
ESC
ESC
ESC
(short press) SCROLL UP
• increase one step
(long press):
• enter the function or confirm
• light is available in:
- top menu
- chrono mode
- free mode
(long press)
• return to the TOP menu
• in free mode: session
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WATCHFACE
MAIN MENU
POST ACTIVITY
AFTER FREEDIVE
NO FLY TIME
COUNTDOWN
TOP
DATE AND TIME DISPLAY
2nd TIME
2nd TIME
CHOOSE THIS MODE TO
SAVE BATTERY
ECO
PRESS (long press)
TO CHANGE DISPLAY
INFORMATION
ESC
From the TOP menu, use the UP /DOWN buttons to scroll through the screens in the main menu:
[
[
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CHRONO
From this screen, pressing
SEL
accesses the
function. To start or stop the stopwatch, press the UP /DOWN buttons.
You can read split times by pressing DOWN while the
stopwatch is running. In this case, the time on the upper left will be replaced by
the word "LAP", and you'll be able to read the intermediate times on the center
line of the display.
SEL ESC
START / STOP
LAP / RESET
TIME HOURS
MIN. SEC.
ESC
TO RETURN
Press
ESC
to exit the LAP function.
Press the DOWN button (when the stopwatch is stopped) to reset the stopwatch.
The first line on the display will show the current time, and the stopwatch hours.
The central line shows the stopwatch minutes, seconds, and tenths of a second.
The tenths are only displayed for the first ten minutes.
The stopwatch will be reset automatically after 24 hours.
To exit this mode press
ESC
.
NOTE: If you exit the stopwatch function while it is running, the count will
continue in the background.
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TIMER (COUNTDOWN)
From this screen, pressing
SEL
accesses the
This function lets you set a countdown.
The timer can be set anywhere from 1” to 23h 59’ 59”.
Setting the Timer
From the screen press
SEL
.
Press UP /DOWN to move to seconds, minutes, or hours. The unit selected
will flash.
Press
SEL
and then UP /DOWN to change the parameter.
Press the
SEL
button until you hear the confirmation beep.
Press
ESC
to exit the function
NOTE: If you exit the Timer function while it is running, the countdown will
continue in the background.
Starting the Timer
Press UP /DOWN to start/stop the timer. When the timer is stopped, press
DOWN to return the timer to the starting point.
At the end of the countdown (timer at zero), an alarm will sound for 3 seconds.
SEL ESC
TIME HOURS
SEC.
MIN.
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DUAL TIMER (DUAL-T)
This function is specifically for training, such as when performing repetitive exer-
cises with rest intervals.
It consists of two timers, PHASE 1 and PHASE 2, which alternate. Each can be set
to a time from 00’:01” a 59’:59”.
The two timers can be repeated up to 99 times (CYCLE 00-99),
counting either up or down .
Set the DUAL TIMER as follows:
Press
SEL
from the DUAL-T menu, and then scroll through the following
functions with the UP /DOWN buttons:
Timer phase 1 (PH-1) seconds
Timer phase 1 (PH-1) minutes
Timer phase 2 (PH-2) seconds
Timer phase 2 (PH-2) minutes
Set the number of cycles (CL-00/99)
Set cycle count direction / .
Press
SEL
to enter the submenus and use UP /DOWN to adjust their
values.
Press
ESC
to exit the Dual Timer settings.
After having sent the Dual Timer, press the UP /DOWN buttons to start or
stop the count.
START/STOP
RESET
Each time the watch changes phase, three short audible signals will sound. When
the end of the cycle count is reached, three long audible signals will sound.
SEL ESC
PHASE
MINUTES SECONDS
CYCLE NUMBER
CYCLE DIRECTION
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MODE SET (MODE-S)
This function lets you choose the mode you want to use.
To enter this function from the MODE-S menu, press the
SEL
button.
The first line will show the word SET and will show the mode that is currently
selected (flashing).
Scroll using the UP /DOWN buttons to select the FREE mode to use while
free diving, or OFF mode, which will disable the pressure sensor.
OFF mode can be useful for example when you're in the pool, snorkeling,
or whenever you don't want to record dives to your computer. OFF mode also
helps extend the life of the battery.
Confirm the mode you want by pressing
SEL
until you hear the confirmation
beep.
Press the
ESC
button to return to the main menu.
WARNING: If your dive computer is in OFF mode we recommend that you
unlock it before each dive. For safety reasons, the computer will remain locked
even during the dive, and you can only unlock it by returning to the surface
and raising it out of the water. Once unlocked, it will not take into account time
spent in the water up to that point. We therefore recommend that you do not
proceed with the dive immediately after unlocking.
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