Zeagle N2iTion3 User manual

N2iTion3 Dive Computer
Owner’s Manual

ii
WARNINGS
Before using the N2iTion3, it is extremely important that you read the
following points as well as similar warning and caution notices that
appear throughout this manual. Failure to do so could result in dam-
age to or loss of equipment, serious personal injury, or death.
The N2iTion3 is designed for use by certied, recreational divers who
have obtained a sufcient level of knowledge and skill prociency through
formal training, ongoing study and experience. It is not intended for use by
persons who lack the qualications, and thus may not be able to identify,
assess, and manage the risks scuba diving entails. Use of the N2iTion3 in
conjunction with Enriched Air Nitrox (EANx) further requires that the diver
be trained and certied for Nitrox diving.
The N2iTion3 is not intended for use by commercial, military or technical
divers whose activities may take them beyond the commonly accepted
depth limits for recreational diving.
The N2iTion3 is designed for use by divers breathing either normal com-
pressed air or Enriched Air Nitrox (EANx) mixtures whose fraction of
Oxygen falls within a range of 22 to 99%.
Although the N2iTion3 is capable of calculating decompression stop
requirements, this ability is provided as a safety feature only, should a
diver accidentally exceed the No-Decompression Limits (NDLs). Dives
requiring mandatory stage decompression carry substantially greater risk
than dives made well within no-decompression limits.
Decompression diving is widely believed to entail substantially great-
er risk of decompression illness than dives made well within the No-
Decompression Limits (NDL). The N2iTion3 provides decompression stop
information solely as a contingency in case divers accidentally exceed
the No-Decompression Limits. It is not designed or intended for use
as a tool to plan or execute dives that participants know will entail
mandatory decompression.

iii
WARNINGS
The N2iTion3 is designed to be used by only one diver at a time. Divers should
not share a single N2iTion3, or any dive computer, on the same dive. Additionally,
no diver should lend his or her N2iTion3 to anyone else until it calculates that no
measurable residual nitrogen remains after previous dives, and displays neither the
“Desaturation Time” nor “No Fly” indicators while in Surface Mode. Further, no diver
should use his or her N2iTion3 for repetitive dives unless that same N2iTion3 has
accompanied him or her on all previous dives in the same repetitive dive series.
Neither the N2iTion3, nor any other dive computer presently available, physically
measures the amount of nitrogen present in body tissues, or the rate at which this
nitrogen is being absorbed or released. Instead, the N2iTion3 monitors depth and
time, and uses this data to work a mathematical formula designed to emulate how
individuals in good general health, and whose physical characteristics do not place
them among those at higher risk of decompression illness, are assumed to absorb
and release nitrogen from body tissues. Thus, the N2iTion3 cannot compensate for
factors such as age, obesity, dehydration, cold or exertion, which experts believe
place divers at greater risk of decompression illness. If these, or similar factors
apply to you, use the N2iTion3, and any other dive computer or dive table, with even
greater caution.
Experts still know surprisingly little regarding the exact nature and causes of
decompression illness (also known as decompression sickness, DCI, or DCS).
Susceptibility to DCI may vary substantially from person to person and from day to
day. Neither the N2iTion3, nor any dive computer or table, can guarantee that you
will not suffer decompression illness. Even though you use these items correctly,
you may still suffer DCI. Do not rely on the N2iTion3 as your sole means of avoiding
decompression sickness.
Experts recommend divers wait at least 24 hours following any dive before ying
in an aircraft or driving to altitude. Failure to allow sufcient surface interval
before performing these activities may substantially increase the risk of
Decompression Illness (DCI).
Do not plan dives to depths deeper than those for which the N2iTion3 is capable
of displaying an available No-Decompression Limit. Doing so could cause you to
exceed the No-Decompression Limits or limiting PO2 of 1.6 bar, which may in turn
substantially increase your risk of decompression illness or CNS Oxygen Toxicity
and can lead to serious personal injury or death.

iv

v
1. Common Sense Warnings 1
2. Introduction 1
3. Operating Gas Theory 2
4. Buttons and Display Icons 2
5. Device Tolerances and Limits6
6. Pre-Dive Functions 8
7. In-Dive Functions 17
8. Repetitive Dive Functions 24
9. Dive Log Mode26
10. Dive Prole Mode27
11. Dive History Mode 27
12. PC Transfer Mode28
13. Resetting 28
14. Care and Cleaning 29
15. Battery Replacement 30
16. Accessories 31
17. Warranty 34
Table of Contents

vi

1
1. Common Sense Warnings
As is true of every piece of diving equipment, including all dive computers,
the N2iTion3’s abilities are not limitless. There are certain limitations and
restrictions of which you must be aware, and certain precautions you must
take when using the N2iTion3. This dive computer is for recreational use
and not for professional use. Though the unit will allow use with up to 3
gas mixes containing 21-99% oxygen, individuals who have not taken a
recognized Nitrox diving course should not use the computer for Nitrox
diving. Also, it is very dangerous to set the mixture on the dive computer to
a different value than the gas mix in the tank. Always set your mixes each
time you dive and never dive with incorrect settings.
2. Introduction
Congratulations on your selection of the Zeagle N2iTion3 Dive Computer.
The N2iTion3 is a compact and sophisticated dive instrument that will give
you reliable, trouble-free performance, dive after dive. Please read and un-
derstand this manual completely before using your new Zeagle N2iTion3
Dive Computer. The information in this manual has been developed for
your safety and understanding.
Key Features
Can handle both air and nitrox (or 3 nitrox mixes)•
User changeable PO• 2setting
Visual and Audible alarms•
Safety stop function•
Decompression and non decompression dive information•
Digital Compass•
Gage mode•
Maximum depth alarm•
Dive time alarm•
Display backlight•
Dive History Mode•
User changeable battery•

2
3. Operating Gas Theory
This dive computer performs decompression diving calculations using
12 compartment algorithms developed by Mr. C. Randy Bohrer based on
Swiss-model theory and research. It is intended for use by individuals who
have completed a recognized scuba diving course. Persons who have not
taken scuba diving training or who are not aware of the risks of scuba div-
ing should not use this unit.
This computer is designed with the assumption that you will be doing no-
decompression diving. It also provides decompression data just in case,
but this is dangerous and should be avoided.
This dive computer’s standard settings assume the user is of average
physical strength and in ordinary health. The individual diver should there-
fore dive responsibly and make a safe diving plan suited to him or herself.
This dive computer is designed to be used by only one diver. Therefore,
if lending it to another person, you should start completely over from the
beginning status (Desaturation time, PGT graph and OLI graph should all
be 0) and the computer should not be displaying the ‘Surf. Time’ or ‘Do Not
Fly’ icons. You should never lend the computer to someone when doing
repeated dives.
4. Buttons and Display Icons
Dive Icon : This icon is displayed in the lower left of the display when
the computer is in Dive Mode, non-decompression limits and decompres-
sion stops are calculated in this mode.
Gage Icon : This icon is displayed in the lower left of the display
when the computer is in Gage Mode. Only time, depth and temperature are
calculated in this mode.
Nitrox Icon : This icon appears in the lower left of the display when
any of the 3 gas mixes FO2 is set to any value other than AIR (21%). This
icon will blink if the computer is using default values.
Depth Alarm : This icon appears in the lower right of the display
when the user has an alarm set to sound at a certain depth.

3
Dive Time Alarm : This icon appears in the lower right of the display
when the user has an alarm set to sound after a certain amount of dive
time.
Log Book Icon : This icon appears in the upper right of the display
when you are in Log Mode or Prole Mode to indicate that you are viewing
saved data from a previous dive.
Deco Icon : This icon appears in the upper left of the display if the
diver has violated the No Decompression Limits. The computer will display
depth and time information for decompression stops. The icon will blink if
the Deco stops are violated
Do Not Fly Icon :
This icon is on when the computer calculates desaturation time remains.
When the computer determines desaturation time is complete, the icon will
turn off. If the computer calculates a desaturation time less than 12 hours,
the icon will stay on for 12 hours. In gage mode the icon is turned off after
48 hours of surface time.
Battery Icon : Displays current battery voltage, as follows.
When battery voltage is 2.8V or above the battery Icon is OFF. •
When battery voltage is 2.6 to 2.7V the battery Icon blinks. •
When battery voltage is less than 2.6V the battery Icon is ON.•
You cannot go into dive mode while the battery indicator Icon is blinking
or ON. All other modes will function. Battery voltage is automatically mea-
sured during all modes except PC Transfer and Dive Mode.
Important! Once the battery indicator is blinking or ON you must return
the N2iTion3 to your local authorized Zeagle dealer for battery replace-
ment, or replace the battery yourself following the procedure outlined later
in this manual. Before replacing your N2iTion3’s battery, be sure to upload
or copy all dive log data to your log book, as the battery replacement pro-
cess erases all such data from the N2iTion3’s memory.

4
Altitude Icon :
The N2iTion3 automatically measures and calculates the current loca-
tion’s altitude and displays the corresponding altitude rank. A new altitude
measurement and calculation is made once every ten minutes.
When the altitude is over 19680 feet (6000 meters), the display will blink
while showing the altitude rank and ‘Err’ icons, the dive computer will not
function until the altitude drops to a lower level (under 19680 feet (6000
meters)). The calculations of PGT, OLI and desaturation time are stopped
when altitude is over 19680 feet (6000 meters), and ‘Err’ is displayed; how-
ever surface time continues to be counted. When the altitude is less than
19680 feet (6000 meters), the display shown before reaching that altitude
is displayed again. The same displays and processing occur if the altitude
cannot be measured for any reason.
Altitude measurements are made during all modes except Dive and PC
Transfer Mode. The computer will display the current altitude setting icon
in Time Mode and Plan Mode (In Dive Log Mode the rank of the dive is
displayed.)
Altitude Rank Altitude Range
00-900m (0-2952ft)
1 600-1800m(1968-5904ft)
2 1500-2600m(4920-8528ft)
32300-6000m(7544-19680ft)
Err Over 6000m(over 19680ft)
WARNING
The N2iTion3 is not intended for use at altitudes above 19680 ft
(6000 m). Diving at high altitudes carries an increased risk of decom-
pression sickness.

5
CAUTION
A change in the altitude rank will cause PGT graph to be dis-•
played and desaturation time to be performed even if the PGT
graph was not previously active.
Never touch the water detection switch (• E, shown in gure 1) or
expose it to moisture when on an airplane or in any other envi-
ronment where air pressure can change quickly.
When the PGT graph is high (7 or 8 bars), a change in the altitude •
rank may cause the ninth level indicator to appear. To prevent
this, never use the dive computer when going to high-altitude
locations, since it will disable dive mode as a safety precaution.
Normal function of the dive computer will be restored when the
PGT graph drops to 8 bars or less.
A difference of one minute may occur between when the PGT •
graph is turned off and when desaturation time is turned off.
Operating the Display Modes
There are some display modes that the N2iTion3 enters and/or exits
automatically. For example, by taking the N2iTion3 underwater, the unit
will switch to Dive Mode. Upon surfacing the unit will enter Surface Mode.
To access other modes you may need to push one of the three large but-
tons on the N2iTion3’s face. These are the A (LEFT), B (MODE), and C
(RIGHT) buttons. The E (TOP) button is the water sensor.
Most functions are accessed with a single button press. Others require
holding the button until you get the desired effect.
Throughout this manual, displays or icons that blink are shown with lines
around them as shown below:
or

6
5. Device Tolerances and Limits
Accuracy
Time: average monthly variance ±30 seconds•
Depth: ±3%+0.5m (±1%+2ft)•
Temperature: ±2.0°C (±4°F)•
Measurement Range
Depth: 0.0-99.9m(0.0-328ft) (Uses saltwater as standard)•
Measurement interval of 1 second.
Dive time•
Dive Mode: 0-599 minutes
Gage Mode: 0-1199 minutes
Altitude: 0-6000m (0-19680ft)•
Measurement interval of 10 minutes. (Does not function in Dive Mode
or PC Transfer Mode)
Operating temperature
Operating temperature: -5 ~ +45°C (23 ~ 104°F)•
(At cold temperature, the display will be somewhat dim)
NITROX Setting
FO2 21-99%, increments of 1%•
Units of Measurement
You can change the units of water depth and temperature by pressing •
and holding A and C in Dive Set Mode
Water depths units change from Meters to Feet•
Temperature units change from Centigrade to Fahrenheit•
Values are based on Meters and °C and converted to Feet and °F•
Battery Life
About 1.5 years in Time Mode (uses CR2032 battery)•
Out of measurement range condition
All display segments on the screen blink during this alarm.
A• :(LEFT) Press this button to for 3-4 seconds to change the Mix. The
backlight will be on for 4-5 seconds.
B• :(MODE) Turns on the backlight for 4-5 seconds.

7
Hold C• :(RIGHT) to display the temperature, dive time, maximum water
depth and FO2 setting. The backlight will come on for 4-5 seconds.
At a depth less than 5 feet (1.5 m) the water detection button switches •
OFF and the N2iTion3 moves to a lock condition.
Out of measurement range lock
In this mode the N2iTion3 is locked until 48 hours have elapsed. All display
segments blink during time mode. The computer can’t move to dive plan
mode, dive set mode or time set mode.
A• :(LEFT) Press this button to select the place you want to change. In
time mode, display and backlight is on from 4-5 seconds.
B• :(MODE) This button is the mode select button.
Time mode—>Dive log mode—>Dive prole mode—>PC transfer •
mode —>Time mode
C• :(RIGHT) Press this button to change settings of the selected item. In
time mode, backlight is on from 4-5 seconds.
WARNING
An N2iTion3 displaying an “Out of Range” warning is incapable of
displaying other critical information such as depth, time, Ascent Rate,
PO2, OLI, and Deco Stop Violations, and required decompression
stops. You should not under any circumstances use an N2iTion3 in
such a way that would cause the Out of Range Warning to be dis-
played. Under such conditions, the risk of serious personal
injury or death would be substantial.

8
6. Pre-Dive Functions
Before diving with your N2iTion3 you will need to set the date and time.
You can also set your FO2 for up to 3 mixes, depth alarm, dive time
alarm, safety factor, water type, deep stop option, and prole interval.
Compass Mode
To enter Compass mode from Time mode press the B(MODE)
button once. The rst time you enter Compass Mode you
will be required to set the compass declination (see below).
PGT Graph
Current Heading
Azimuth
Current Time
.Figure 1
A• (LEFT): backlight on for 4-5 seconds.
Hold• A (LEFT) button to save your current heading.
B• (MODE): Moves to Dive Set mode.
C• (RIGHT): backlight is on from 4-5 seconds.
Hold C• (RIGHT) button key until the dot matrix dis-
play reads will set the compass declination.
Slowly rotate the computer 360 degrees, the graph will indicate ro-
tation as you go. When the process is complete, the display will
read ROTATION OK.
Note: All display segments ash when locked in the out-of-range state
or the decompression stop violation state.

9
Time Set Mode
You should set the correct current date and time before you use your
N2iTion3 for the rst time.
Current Date
Current Year
Current Time
.Figure 2
A• (LEFT): Steps between setting minutes, hour, year, month, day,
12/24 hour format.
B• (MODE): Moves to Time Mode
C• (RIGHT): Increases value when setting minute, hour, year, month
or day. Resets to :00 when setting seconds.
Hold C• (RIGHT): Increases value rapidly while holding button.
A + C• : Activates all segments on display. This will allow you to
verify every segment of the display is functioning.
Upon entering time mode, press A (LEFT) to get to the unit you want to
set, use C (LEFT) to set the correct value, then A (LEFT) to move to the
next unit. After setting time and date, will appear, press C
(RIGHT) to select between 12 and 24 hour clock modes.
With the all segment on display active, pressing A (LEFT) or C (RIGHT)
will return to Time Set Mode. Pressing B (MODE) will enter the contrast
setting menu. The default value is 20, C (RIGHT) will increase the con-
trast. When it reaches maximum it will loop to minimum, at this time
the display may appear blank, continue pressing C (RIGHT) until the
desired contrast level is reached. Pressing B (MODE) will then save the
setting and return to Time Set Mode.

10
Dive Set Mode and Gage Dive Set Mode
To enter Dive Set mode from Compass mode press the B (MODE) button
once.
Note: If the surface interval is less than 10 minutes the computer will not
enter gage mode.
In Set mode the following information is displayed:
Dive Set Mode
.Figure 3
NITROX Icon User Safety Factor
Current PO2
Dive Icon
Depth Alarm Dive Time Alarm
Maximum Depth of PO2
Fraction of Oxygen
Do Not Fly Icon
Gage Dive Set Mode
.Figure 4
Gage Icon
Depth Alarm Dive Time Alarm
Do Not Fly Icon
Fraction of oxygen (FO2): setting range 21-99%•
Maximum depth of PO2: Based on the fraction of oxygen, this indicates •
the water depth where the PO2 (pressure of oxygen) reaches the set
PO2 limit for that mix (from 1.0 to 1.6). If the water depth rank exceeds
the maximum water depth for the PO2 limit, the no-decompression
limit displayed will show bars (‘---’).
User Safety Factor (USF): If the level is “0” the usual algorithm is used •
for dive calculations. When the level is changed to “1” or “2” the next
higher altitude setting is used.

11
Proling time: This setting is the sampling time used during the dive, it •
can be set to either 10 or 30 second intervals.
Maximum Depth Alarm: This alarm will generate a sound when it •
reaches the set depth. The setting range is 4-328 ft. (2-99 meters),
and can be set in 1 foot increments.
Dive time alarm: This alarm generates a sound when it reaches a div-•
ing time value set by the diver. The setting range is 1-599 minutes in 1
minute increments.
Nitrox Icon: This Icon is ON when any mix has been set to a value •
other than “AIR” (MIX1) or “--” (MIX2 and MIX3). It blinks if the MIX2
and MIX3 settings are at the default value.
Sea/Fresh Water: This display indicates if the computer is set to calcu-•
late based on sea water or fresh water.
Gage Mode Icon: This icon will be displayed if gage mode has been •
selected.
CAUTION
The “--” display: The setting changes to this display automatically
at Midnight (00:00) on the day the MIX value was set, except when
the setting is “AIR”. If the user forgets to set the FO2 an audible
and ashing alarm is generated when the computer moves to Dive
mode.
If MIX1 is set at “AIR” (21%) and MIX2 or MIX3 is set at 21% or “--%”
the setting for MIX1 will remain at 21%. The displayed setting for
MIX2 and MIX3 will always revert to “--%” at Midnight (00:00) on the
day the value was originally set.

12
Operation of buttons during Dive Set and Gage Set mode.
A• :(LEFT) Selects the value you would like to set.
B• :(MODE) Moves to the next Mode.
Hold• B:(MODE) Moves to Time Mode.
C• :(RIGHT) Changes the value of the current setting.
Hold• C:(RIGHT) Scrolls through values quickly.
Hold• A + C to switch between ft/°F and m/°C
Auto return: The display automatically returns to Time Mode when no•
buttons are used for 2-3 minutes.
NOTE: If PGT, OLI, DESAT, and the SURF.T are active, it isn’t possible •
to switch to Gage Select Mode
Setting Dive/Gage Mode
Press • A and “DIVE” will blink
C• selects “DIVE” or “GAGE”
A• continues to set MIX1
Setting MIX1, MIX2, MIX3
C• changes PO2 value.
A• selects MIX1 FO2 value
C• changes FO2value
A• continue and set MIX2.
B• continues to Plan Mode.
Note: If no value is set for MIX2, you can not set MIX3.
Setting Depth Alarm
C• changes depth value.
A• selects ON/OFF
C• toggles Depth Alarm ON/OFF
A• continues to set Dive Time Alarm
B• continues to Plan Mode.

13
Setting Dive Time Alarm
C
• changes time value.
A• selects ON/OFF
C• toggles Time Alarm ON/OFF
A• continues to set Deep Stops
B• continues to Plan Mode.
Setting Deep Stops
C• toggles Deep Stops ON/OFF
A• continues to set Water type
B
• continues to Plan Mode.
Setting Water Type
C
• toggles SEA/FRESH
A• continues to set Prole Time
B• continues to Plan Mode.
Setting Prole Time
C
• toggles 10 sec. / 30 sec.
A• continues to set User Safety
B• continues to Plan Mode.
Setting User Safety Factor
C
• toggles level 0, 1, 2
A• returns to Dive Set Mode
B• continues to Plan Mode.

14
During Gage mode certain functions are not available. The buttons
used for the remaining functions are the same as in Dive Mode. The
order of the functions is: Depth Alarm, Dive Time Alarm, Water Type,
Prole Time.
You cannot set MIX1, MIX2, MIX3, Deep Stops, or Safety Factor in
Gage Mode.
Setting Depth Alarm
C• changes depth value.
A• selects ON/OFF
C• toggles Depth Alarm ON/OFF
A• continues to set Dive Time
Alarm
B• continues to Plan Mode.
Setting Dive Time Alarm
C
• changes time value.
A• selects ON/OFF
C• toggles Time Alarm ON/OFF
A• continues to set Deep Stops
B• continues to Plan Mode.
Setting Water Type
C
• toggles SEA/FRESH
A• continues to set Prole Time
B• continues to Plan Mode.
Setting Prole Time
C
• toggles 10 sec. / 30 sec.
A• continues to set User Safety
B• continues to Plan Mode.