Zeagle N2ition User manual

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1. Introduction 3
2. Key Features 3
3. Common Sense Warnings 3
4. Accessing Display Modes 6
5. Time Mode 7
6. Battery Indicator 8
7. Altitude Setting 9
8. Dive Set Mode and Gage Dive Set Mode 11
9. Dive Plan Mode 14
10. Dive Log Mode 16
11. Dive Prole Mode 21
12. PC Transfer Mode 23
13. Date and Time Set Mode 24
14. Dive Mode (Gage Dive Mode) 25
15. Various Warnings 31
16. Gage Mode 37
17. N2iTion Computer Reset 39
18. Battery Replacement 39
19. Units of Measurement 40
20. General Handling 40
21. Warranty 41
22. Technical Specications 43
Table of Contents

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1. Introduction
Congratulations on your selection of the Zeagle N2iTion Dive Computer. The
N2iTion is a compact and sophisticated dive instrument that will give you a
reliable, trouble free performance, dive after dive.
Please read and understand this manual completely before using your new
Zeagle N2iTion Dive Computer. The information in this manual has been
developed for your safety and understanding.
2. Key Features
• Can handle both air and nitrox (or 2 nitrox mixes)
• User changeable PO2setting
• Visual and Audible alarms
• Safety stop function
• Decompression and non decompression dive information
• Gage mode
• Maximum depth alarm
• Dive time alarm
• Display backlight
• User changeable battery
3. Common Sense Warnings
As is true of every piece of diving equipment, including all dive computers,
the N2iTion’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 N2iTion.

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WARNINGS
Before using the N2iTion, 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 damage to or loss of
equipment, serious personal injury, or death.
The N2iTion 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 N2iTion in conjunction with Enriched
Air Nitrox (EANx) further requires that the diver be trained and certied for
Nitrox diving.
The N2iTion 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 N2iTion is designed for use by divers breathing either normal compressed
air or Enriched Air Nitrox (EANx) mixtures whose fraction of Oxygen falls
within a range of 22 to 50 % for mix one, and 22 to 99% for mix two.
Although the N2iTion 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 greater risk
of decompression illness than dives made well within the No-Decompression
Limits (NDL). The N2iTion 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.

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WARNINGS
The N2iTion is designed to be used by only one diver at a time. Divers should not
share a single N2iTion, or any dive computer, on the same dive. Additionally, no
diver should lend his or her N2iTion 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 N2iTion for repetitive dives unless that same N2iTion
has accompanied him or her on all previous dives in the same repetitive dive series.
Neither the N2iTion, 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 N2iTion 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 N2iTion 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 N2iTion, 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 N2iTion, 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 N2iTion 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 N2iTion is capable
of displaying an available No-Decompression Limit. Doing so could cause you to
exceed the No-Decompression Limits or limiting PO2of 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.

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4. Operating the Display Modes
(MODE)
MODE
There are some display modes that the N2iTion enters and/or exits
automatically. For example, by taking the N2iTion underwater, you
automatically activate its Dive Mode. Upon surfacing your N2iTion will
automatically enter Surface Mode.
To access other modes you may need to push one of the three large, grey
buttons on the N2iTion’s face. These are the A (LEFT), B (MODE), and C
(RIGHT) buttons. (Fig. 1)
You will nd these buttons easy to use. In some instances you may need
only press a button once and release it to achieve the desired result. In other
instances, you may need to hold the button down until you get the result you
wish. This manual will outline clearly which procedure to follow for each
mode or task.
Throughout this manual, display icons that blink are shown within a gray
square.
D
A B C
Fig. 1

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5. Time Mode
Time mode is the N2iTion’s default mode. In this mode the screen displays
a minimum of the current date and time of day. Within 24 hours of surfacing
from a dive, the N2iTion will display additional information while in Time
Mode. A description of the screens is shown below.
Note: Blinking icons are shown in a square.
Current time: This is the current time of day. (Fig. 2)
Current date: This is the current date. (Fig. 2)
Battery indicator Icon: This displays the current battery voltage. (not
shown)
PGT (Pressure Gas in Tissue) graph: This indicates the level of
Nitrogen with nine level indicators. (Fig. 3)
OLI (Oxygen Limited Indicator) graph: This indicates the level of
Oxygen limit with eight level indicators. (Fig. 3)
Nitrox Icon: This Icon is ON when NITROX has been set for MIX1
or MIX2. It blinks if the MIX1 and MIX2 setting is the default
setting. (Fig. 3)
Desaturation time (DESAT): This indicates the time remaining until
the body’s internal nitrogen is desaturated. (Fig. 3)
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Normal After Dive
Current Time
Current date
PGT Graph NITROX Icon
Altitude Rank
OLI Graph
Don’t Fly Icon
Desaturation Time
Surface Time
Mode
Fig. 2 Fig. 3

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Surface time (SURF.T): This is the surface interval time after a dive.
The timer is started from when the depth shown in Dive mode
reaches 5 feet (1.5m) or less. If the depth changes back to 5 feet
(1.5m) or more in less than 10 minutes, the previous dive is
continued. Surface time is continued for 48 hours. After that, surface
time is turned off. (Fig. 3)
Mode: This display shows the computer in Time mode. (Fig. 2)
Don’t Fly Icon: While the computer calculates desaturation time
this icon is displayed during Time Mode. When the computer has
nished calculating desaturation time this Icon is turned off. (Fig. 3)
Gage Mode Icon: If the computer is in Gage mode this icon will
appear.
6. Battery Indicator
Battery Indicator Icon: This displays the 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 2.7 V the battery Icon blinks. When
battery voltage is less than 2.6 V the battery Icon is ON.
You cannot go into dive mode while the battery indicator Icon is blinking
or ON. The Icon can be displayed during all other modes. Battery voltage is
automatically measured during all modes except PC transfer and dive mode.
Important!
Once the battery indicator is blinking or ON you must return the N2iTion to
your local authorized Zeagle dealer for battery replacement, or replace the
battery yourself following the procedure outlined later in this manual. Before
replacing your N2iTion’s battery, be sure to upload or copy all dive log
data to your log book, as the battery replacement process erases all such
data from the N2iTion’s memory.
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7. Altitude Setting
The N2iTion automatically measures and calculates the current location’s
altitude and displays the corresponding altitude rank. The relation between
altitude rank levels and altitudes are shown below. 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 and 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;
however 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
0 0-900m (0-2952ft)
1 600-1800m(1968-5904ft)
2 1500-2600m(4920-8528ft)
3 2300-6000m(7544-19680ft)
Err Over 6000m(over 19680ft)
Fig. 4
Warning
The N2iTion is not intended for use at altitudes above 19680 ft (6000 m).
Diving at high altitudes carries an increased risk of decompression
sickness.

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Below are the Altitude Setting Icons for the rank of 0,1,2,3. If the altitude
exceeds 19680 feet the icon will blink and the Err icon will be displayed.
(Fig. 5)
If the Altitude exceeds 19680 feet (6000 meters) the display shown below
will appear. (Fig. 6,7)
Altitude Rank
Fig. 5
Fig. 6 Fig. 7
Blink
Caution
A change in the altitude rank will cause PGT graph to be displayed and
desaturation time to be performed even if the PGT graph was not previously
active.
Never touch the water detection switch (D, shown in gure 1) or expose it to
moisture when on an airplane or in any other environment 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 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.
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Operation of Buttons During Time Mode
Prior to a dive
The letters correspond to the buttons of the N2iTion shown in gure 1.
A (LEFT): EL back light is on from 4-5 seconds.
B (MODE): Press this button to move to dive set mode.
C (RIGHT): EL back light is on from 4-5 seconds.
D (TOP): When water is detected, the mode moves to dive mode
During a Surface Interval
A (LEFT): EL back light is on from 4-5 seconds.
B (MODE): Press this button to move to dive set mode , but if
surface time is less than 10 minutes, display moves to dive plan
mode.
In gage mode press “B” to move to the gage dive set mode display.
If surface time is less than 10 minutes the mode moves to dive log
mode .
C (RIGHT): EL back light is on from 4-5 seconds.
D (TOP): When water is detected, the mode moves to dive mode.
8. Dive Set Mode and Gage Dive Set Mode
To enter Dive Set mode from Time mode press the B (MODE) button once.
Once in Dive Set mode press the C (RIGHT) button to enter Gage mode.
Note: If the surface interval is less than 10 minutes the computer will not
enter gage mode.
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NITROX Icon
User Safety Factor
Sea/Fresh Icon
Gage Icon
Proling Time
Maximum Depth of PO2
Fraction of Oxygen Fig. 8
Fig. 9

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Maximum Depth Alarm Dive Time Alarm
Fig. 10 Fig. 11
In Dive Set mode the following information is displayed.
Fraction of oxygen (FO2): (Fig. 8)
MIX1 setting range: Fraction of oxygen 21-50%
MIX2 setting range: Fraction of oxygen 21-99%
Maximum depth of PO2: Based on the fraction of oxygen, this indicates
the water depth where the PO2(pressure of oxygen) reaches 1.4 (MIX1)
or 1.6 (MIX2). (Fig. 8)
If the water depth rank exceeds the maximum water depth 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. The default setting is “0”. (Fig. 9)
Proling time: This setting is the sampling time used during the dive.
(Fig. 9)
Maximum Depth Alarm: This alarm will generate a sound when it
reaches the set depth. The setting range is 30-320 ft. (9-99 meters), and
can be set in 10 foot increments. (Fig. 10)
Dive time alarm: This alarm generates a sound when it reaches a diving
time value set by the diver. (Fig. 11)
The setting range is 10-590 minutes in increments of 10 minutes.
Nitrox Icon: This Icon is ON when NITROX has been set for MIX1 or
MIX2. It blinks if the MIX1 and MIX2 settings are at the default value.
(Fig. 8)
Sea/Fresh Icon: This icon indicates if the water setting is sea water or
fresh water. (Fig.8)
Gage Mode Icon: This icon will be displayed if gage mode has been
selected. (Fig. 9)
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Caution
The “--” display: The setting changes to this display automatically at
24:00 on the day the MIX value was set except when the setting is Air
(FO2equals 21%). If the user forgets to set the FO2 an audible and ashing
alarm is generated when the computer moves to Dive mode.
If MIX 1 is set at Air (21%) and MIX 2 is set at 21% or “--%” the
setting for MIX 1 will remain at 21%. The displayed setting for MIX 2 will
always revert to “--%” at 24:00 on the day the value was originally set.
Operation of Buttons during Dive and Gage Set mode.
A: Press the A (LEFT) button to select the function you would like to
modify.
Gage SELECT—>MIX1 FO2set—>MIX2 FO2set—>User Safety
Factor—> Prole time—>Sea/Fresh—>MAX DEPTH SET—>MAX
DEPTH ALARM ON/OFF—>DIVE TIME SET—>DIVE TIME
ALARM ON/OFF—>Gage SELECT—>
B:(MODE) Press this button to move to the Dive Plan Mode .
(In Gage Mode, press this button to move to Dive Log Mode.)
C:(RIGHT) Press this button to change the settings value.
C:(RIGHT) Press and hold this button to change setting the contents
using fast scrolling.
D:(TOP) When water is detected the mode moves to Dive Mode.
Auto return: The display automatically returns to Time Mode when no
buttons are used for 2-3 minutes.
B:(MODE) Press and hold this button for 1-2 seconds to move to Time
Mode.
CAUTION
If PGT, OLI, DESAT, and the SURF.T are active it isn’t possible to switch to
Gage Select Mode.
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9. Dive Plan Mode
To enter Dive plan mode from Time mode press the B (MODE) button twice.
Note: This mode cannot be entered while using Gage Mode.
Altitude Rank NDL (No decompression Limit Time
Surface Time
OLI Graph
Sea/Fresh Icon
Fraction of Oxygen
PGT Graph
Don’t Fly Icon
Depth Rank
Fig. 12
Mode
The following functions are displayed in Dive plan mode. (Fig. 12)
Depth rank and NDL (non-decompression limit): Use this function to
set the planned dive depth and corresponding depth rank. There are
14 depth ranks, as shown below. The NDL corresponding to the
current PGT graph is displayed. The displayed NDL is for when
MIX1 is used. The maximum displayable NDL is 200 minutes.
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30 ft. 40 ft. 50 ft. 60 ft. 70 ft. 80 ft. 90 ft.
100 ft. 110 ft. 120 ft. 130 ft. 140 ft. 150 ft. 160 ft.

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PGT (Pressure Gas in Tissue) graph: This bar graph shows the amount of
Nitrogen using nine indicator segments .
OLI (Oxygen Limited Indicator) graph: This bar graph shows the level of
the Oxygen Limit with eight indicator segments.
Fraction of oxygen: This displays only MIX1 as the current setting.
Sea/Fresh Icon: This indicates the water setting (sea water/fresh water).
Altitude rank: The computer automatically measures and calculates the
current location’s altitude and displays the corresponding altitude rank.
Nitrox Icon: This Icon is ON when NITROX has been set for MIX1 or
MIX2. It blinks if the MIX1 and MIX2 setting are using the default
setting. The FO2must be set prior to diving with the N2iTion.
Don’t Fly Icon: While the computer calculates desaturation time, this
icon is turned on in Time mode. When the computer has nished
calculating desaturation time and Time Mode is over 12 hours, this Icon
is turned off.
Desaturation time: This indicates the time remaining until the body’s
internal nitrogen is desaturated.
Surface time: This is the surface interval time after a dive. Surface time
is started from when the depth shown in Dive Mode reaches 5 feet
(1.5m) or less. If the depth changes back to 5 feet (1 .5m) or more within
10 minutes the previous dive mode is continued. Surface time is
displayed for 48 hours after the last dive.
Operation of buttons during dive plan mode
A:(MODE) Press this button to decrease the depth rank.
B:(LEFT) Press this button to move to dive log mode.
C:(RIGHT) Press this button to add one to the depth rank.
D:(TOP) When water is detected computer moves to dive mode.
Auto return: The display automatically returns to time mode when no
buttons are used for 2-3 minutes.
B:(LEFT) Press and hold this button for 1-2 seconds to move to time
mode
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10. Dive Log Mode
To enter Dive log Mode from Time Mode press the B button three times.
Display 1
Display 2
No Data
Fig. 13
Fig. 14
Fig. 15
Dive Date
Dive Start Time
Fraction of Oxygen Log Number
Dive End Time
Dive Number
Dive Time
Water Temperature
PGT Graph
Maximum Depth
Ascent Rate Indicator
Average Depth
OLI Graph
User Safety Factor
Mode

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Description of the Dive Log functions
The Dive log mode records various data during a dive when the dive depth is
at least 5 feet (1.5m) and the dive time is at least 3 minutes. Data is recorded
during each successive dive, and the log data storage capacity is about 30
hours of dive time, or up to 60 log data entries. If the logged dive time
exceeds 30 hours or the number of log data entries exceeds 60, the oldest data
is automatically deleted. (See the section describing prole mode for further
description of log data and prole data.) The logged data is described below.
Log Number: This indicates the number of the log entry being recorded
among the recorded logs. (Fig. 13)
Dive Date/Dive Start Time/ Dive End Time: This is diving information.
Dive date is the date of the dive. Dive start time is the time at the start of
the dive. Dive end time is the time at the end of the dive. Both Dive start
time and Dive end time are displayed in 24 hour format. (Fig. 13)
PGT (Pressure Gas in Tissue) Graph: This represents the level of
Nitrogen with nine level indicators at the end of the dive. (Fig. 14)
OLI (Oxygen Limited Indicator) Graph: This represents the level of the
Oxygen Limit with eight level indicators at the end of the dive. (Fig. 14)
Altitude Rank: This is the altitude setting used during the dive. (Fig. 13)
Nitrox Icon: This Icon is ON when NITROX has been set for MIX1 or
MIX2. It blinks if the MIX1 and MIX2 setting is the default setting.
(Fig. 13)
Fraction of Oxygen (FO2): It displays the FO2which was used while
diving. (Fig. 13)
Dive Time: This is the dive time. (Fig. 13)
Water Temperature: Water temperature at maximum depth. The
measurement range is: 23 to 104° F (-5 to 40° C). It display ‘Lo’ when
water temperature is under 23° F (-5° C). It display ‘Hi’ when water
temperature is over 104° F (40° C). (Fig. 14)
User Safety Factor (USF): When the level is “0” the usual algorithm
is used for calculations. When the level is “1” or “2” the next higher
altitude rank is used for the dive calculations. The default setting is “0”.
(Fig. 14)
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Average Depth: this is the average water depth during the dive. If the
depth is over 328 ft. (99.9m), the display is ‘---’. In Gage mode if depth
is over 656 ft. (199.9m), the display is ‘---’. (Fig. 14)
Maximum Depth: This is the maximum depth recorded during a dive. If
the depth is over 328 ft. (99m) the display is ‘---’. In Gage mode if the
depth is over 656 ft. (199.9m) the display is ‘---’. (Fig. 14)
Ascent Rate Indicator: This is the maximum Ascent rate recorded during
a dive. (Fig. 14)
Sea/Fresh Icon: This indicates the water setting (sea water/fresh water).
(Fig. 14)
Gage mode Icon: If the computer is in gage mode this icon is ON. (Fig.
14)
Warning Displays: These are warnings that can occur during a dive.
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Ascent rate warning Decompression Dive
DECO STOP icon is on
Slow icon blink
Fig. 16 Fig. 17
Fig. 18 Fig. 19
Decompression stop violation Out of measurement range warning
DECO STOP icon blink All segments blink