Uwatec Aladin ONE User manual

®
Aladin ONE
(Matrix)
User Manual

2
ALADIN ONE USER MANUAL
ALADIN ONE DIVING COMPUTER - DESIGNED BY DIVING
ENGINEERS
Welcome to SCUBAPRO dive computers and thank you for purchasing the Aladin One. You
are now the owner of an extraordinary partner for your dives. This manual provides you with
easy access to SCUBAPRO state-of-the-art technology and key Aladin One features and
functions. Should you wish to know more about SCUBAPRO diving equipment, please visit
our website at www.scubapro.com.
IMPORTANT
Please carefully read and understand the Read First booklet that is included in the package before
using your SCUBAPRO Aladin One.
WARNING
• The Aladin One has a depth rating of 120m/394ft.
• If 120m/394ft is exceeded, “---“ will appear in the depth eld and the decompression algorithm
will not calculate correctly.
• Diving at oxygen partial pressures higher than 1.6bar (corresponding to a depth of 67m/220ft when
breathing compressed air) is extremely dangerous and could lead to serious injury or death.
WARNING
• The Aladin One is delivered in deep sleep mode with the display off. You must activate the Aladin
One by pressing and holding the left or right button before the rst dive. The Aladin One will not
start the dive mode or may show the wrong depth value if activation is not done before immersion.
The Aladin One dive instrument is compliant with the European Union directive 2014/30/EU.
Standard EN 13319: 2000
The Aladin One dive instrument is also compliant with the European standard EN 13319: 2000 (EN 13319: 2000 – Depth
gauges and combined depth and time measuring devices – Functional and safety requirements, tests methods).

3
English
ALADIN ONE USER MANUAL
TABLE OF CONTENTS
1. INTRODUCTION .................................................................................................... 5
1.1 Safety considerations .............................................................................. 5
1.2 Quick reference of the display layout ....................................................... 5
2. SYSTEM AND OPERATION .................................................................................. 6
2.1 System description .................................................................................. 6
2.2 Operation ................................................................................................ 6
2.2.1 Push buttons ........................................................................... 7
2.2.2 Water contacts ......................................................................... 7
2.2.3 Switching on the display .......................................................... 7
2.2.4 How to navigate the Aladin One at the surface ......................... 8
2.2.5 Checking the desaturation time ................................................ 8
2.2.6 Checking the surface interval ................................................... 8
2.2.7 Checking the battery condition ................................................. 9
2.2.8 Active backlight ...................................................................... 10
2.2.9 Switching off the display ......................................................... 10
2.2.10 Alarm clock ............................................................................ 10
2.3 SOS mode ............................................................................................ 10
3. DIVING WITH YOUR ALADIN ONE .................................................................... 11
3.1 Terminology/Symbols ............................................................................ 11
3.1.1 General terminology/Display during no-stop phase ................ 11
3.1.2 Display during decompression phase ..................................... 11
3.1.3 Nitrox information (O2information) .......................................... 12
3.2 Attention messages and alarms ............................................................. 12
3.2.1 Attention messages ............................................................... 12
3.2.2 Alarms ................................................................................... 13
3.3 Preparation for the dive ......................................................................... 13
3.3.1 Function check ...................................................................... 13
3.3.2 Setting the gas mixture and ppO2max ................................... 13
3.4 Functions during the dive ...................................................................... 14
3.4.1 Alternate displays ................................................................... 14
3.4.2 Dive time ................................................................................ 14
3.4.3 Current depth/O2% mix .......................................................... 14
3.4.4 Max depth/Temperature ......................................................... 14
3.4.5 Set max depth reached .......................................................... 15
3.4.6 Ascent rate ............................................................................ 15
3.4.7 Partial pressure of oxygen (ppO2max)/
Maximum operating depth (MOD) .......................................... 16
3.4.8 Oxygen toxicity (CNS O2%) .................................................... 16
3.4.9 Decompression information .................................................... 17
3.4.10 Decompression values ........................................................... 17
3.4.11 Total ascent time .................................................................... 18
3.4.12 Safety stop timer .................................................................... 18
3.5 Functions after the dive ......................................................................... 18
3.5.1 End of a dive .......................................................................... 18
3.5.2 Desaturation time, No-fly time and No-dive warning ............... 19
3.6 Diving in mountain lakes ........................................................................ 20
3.6.1 Altitude classes ...................................................................... 20
3.6.2 Prohibited altitude .................................................................. 20
3.6.3 Decompression dives in mountain lakes ................................. 20

4
ALADIN ONE USER MANUAL
4. FUNCTIONS ON THE SURFACE ........................................................................ 21
4.1 Dive planner .......................................................................................... 21
4.1.1 Planning a no-stop dive .......................................................... 21
4.1.2 Planning a decompression dive .............................................. 22
4.1.3 Leaving the dive planner ......................................................... 22
4.2 Logbook ................................................................................................ 23
4.2.1 Survey .................................................................................... 23
4.2.2 Operation ............................................................................... 23
4.2.2.1 Page 1......................................................................24
4.2.2.2 Page 2......................................................................24
4.2.2.3 Page 3......................................................................24
4.2.2.4 Statistical information (HISTORY) ..............................24
5. SETTINGS ............................................................................................................ 25
5.1 Dive menu ............................................................................................. 25
5.1.1 Gas menu .............................................................................. 26
5.1.2 Scuba menu .......................................................................... 26
5.1.3 User menu ............................................................................. 28
5.2 Watch menu .......................................................................................... 29
5.2.1 Setting the alarm clock time ................................................... 29
5.2.2 Setting the UTC offset (coordinated universal time) ................. 30
5.2.3 Adjusting the time of day ........................................................ 30
5.2.4 Selecting 24-hour or AM/PM setting ...................................... 30
5.2.5 Adjusting the date .................................................................. 31
5.2.6 Switching the sound on and off .............................................. 31
5.2.7 Check the battery status ........................................................ 32
6. INTERFACING WITH WINDOWS/MAC AND APPS ........................................... 32
6.1 Introduction to SCUBAPRO LogTRAK ................................................... 32
6.2 Changing warnings/settings of the Aladin One and reading computer
information ............................................................................................ 33
7. TAKING CARE OF YOUR ALADIN One .............................................................. 34
7.1 Technical information ............................................................................. 34
7.2 Maintenance ......................................................................................... 34
7.2.1 Replacing the battery ............................................................. 35
8. APPENDIX ............................................................................................................ 36
8.1 Warranty ................................................................................................ 36
8.2 Glossary ................................................................................................ 37
8.3 Index ..................................................................................................... 38

5
English
ALADIN ONE USER MANUAL
1. INTRODUCTION
Your Aladin One User Manual is divided into
the following main chapters.
1. Introduction
2. System and operation
3. Diving with your Aladin One
4. Functions on the surface
5. Settings
6. Interfacing with Windows/Mac and Apps
7. Taking care of your Aladin One
8. Appendix (warranty, glossary, index).
1.1 Safety considerations
Dive computers provide divers with
data; however, they do not provide the
knowledge of how this data should be
understood and applied. Dive computers
cannot replace common sense! You must
therefore carefully read and understand this
entire manual before using your Aladin One.
1.2 Quick reference of the display layout
DATE
DEPTH
ALTITUDE CLASSES
ALTITUDE SYMBOL
DECOMPRESSION
STOP OBLIGATION
DECOMPRESSION
STOP INDICATOR
BLUETOOTH / ALARM
CLOCK ICON
AVERAGE
DEPTH ICON
O2 MIX
CNS%
ASCENT RATE
TOO FAST ASCENT
SYMBOL
LOW BATTERY ICON
ASCENT TIME ICON
DIVE TIME
SOS DURATION
DO NOT FLY ICON
DO NOT DIVE ICON
MAX DEPTH
TEMPERATURE
...

6
ALADIN ONE USER MANUAL
2. SYSTEM AND OPERATION
2.1 System description
The Aladin One displays all important dive and decompression data and has a memory
which stores the full dive data. This data can be transmitted with a Bluetooth interface
and LogTRAK software to Windows or Mac personal computers, Android devices or Apple
devices.
LogTRAK software is available at the SCUBAPRO website as well as the Android Play Store
and iPhone App Store.
2.2 Operation
Operating schematic

7
English
ALADIN ONE USER MANUAL
2.2.1 Push buttons
The Aladin One’s features are accessed
and controlled with 2 push buttons.
Operation of these push buttons is divided
into 2 methods: “press” and “press-and-
hold” (for 1 second) – also referred to as a
“long” press on the menu diagrams. Each
method allows you to access different
computer functions.
PRESS LEFT
BUTTON PRESS RIGHT
BUTTON
PRESS AND HOLD (1
SEC) LEFT BUTTON
PRESS AND HOLD (1 SEC)
BOTH BUTTON
PRESS AND HOLD (1
SEC) RIGHT BUTTON
At the surface:
PRESS-AND-HOLD LEFT OR RIGHT
BUTTON:
• Switches on the Aladin One (time of day
display).
PRESS-AND-HOLD RIGHT BUTTON:
• Functions like the ENTER/RETURN key
on a keyboard.
• Provides access to the displayed sub
menu.
• Opens the displayed setting.
• Confirms the displayed value or setting
selection.
PRESS LEFT OR RIGHT BUTTON:
• Allows scrolling through menus.
• Once entered into a sub menu or series
of settings:
• Increases (press right button) or
decreases (press left button) the
indicated value or setting.
PRESS-AND-HOLD LEFT BUTTON:
• Activates the backlight in time of day display.
• Escape the current function or menu to
last level or setting.
PRESS-AND-HOLD BOTH BUTTONS:
• Exits the current function or menu and
switches to the time of day display.
• From the time of day display, switches
off the Aladin One.
SCUBA mode:
PRESS RIGHT BUTTON:
• Accesses alternate displays.
PRESS-AND-HOLD LEFT BUTTON:
• Operates the backlight.
PRESS LEFT BUTTON:
• Activates the safety stop timer
(in depths < 5m/15ft).
2.2.2 Water contacts
Upon submerging, the water contacts
activate the Aladin One automatically.
2.2.3 Switching on the display
All segments on:
Start up display with time:
FNOTE: On the lower matrix row on the
display, longer words are scrolled. In
this manual, such scrolling is indicated
by left-pointing arrows running along
the bottom of the display.
Time of day display:

8
ALADIN ONE USER MANUAL
The Aladin One switches on:
• Automatically, upon submerging in
water or when triggered by a change in
atmospheric pressure.
• Manually, by pushing and holding either
the left or right button.
If switched on with the left button, all
display segments appear for 5 seconds.
Afterwards, the display shows the time of
day, the date and a scrolling SCUBAPRO
which is quickly replaced by the day of the
week. This is referred to as the “time of
day” display.
In the time of day display, if there is
remaining saturation from the last dive or
from a change of altitude, the Aladin One
may indicate the “Do not y” icon, “Do not
dive” icon or “Altitude” icon or a combination
of the icons depending on the situation.
FNOTE: Most navigation descriptions in
this manual start from the time of day
display. At the surface, the Aladin One
returns automatically to this display.
FNOTE: When the Aladin One is
in a state of rest, no information
is displayed but the atmospheric
pressure continues to be monitored.
If a change in altitude classes is
detected, the Aladin One automatically
switches on for 3 minutes.
FNOTE: Without active use the Aladin
One’s display automatically reverts
to the time of day display, and after 3
minutes the computer switches off.
2.2.4 How to navigate the Aladin
One at the surface
Starting from the time of day display you
can enter into different menus.
2.2.5 Checking the desaturation
time
From the time of day display you can check
the desaturation time* with a press-and-
hold of the right button. Desaturation time
is determined either by oxygen toxicity,
nitrogen saturation or the regression
of microbubbles, depending on which
requires the longer time.
*Desat time is displayed only if there is
remaining saturation due to the last dive or
a change of altitude.
WARNING
For calculations of desaturation and no-y
time it is assumed that you are breathing air
while on the surface.
2.2.6 Checking the surface interval
From the time of day display you can check
the surface interval with a press-and-hold
of the right button (taking you directly to the
dive menu) and then another press-and-
hold (taking you to surface interval).
Surface interval is the elapsed time since
the end of your last dive; it is displayed as
long as there is remaining saturation.

9
English
ALADIN ONE USER MANUAL
2.2.7 Checking the battery
condition
From the time of day display you can check
the battery condition by pressing the left or
right button to scroll to the watch menu.
With a press-and-hold of the right button
you enter watch settings, then press the
right button 6x to scroll to the battery status
screen.
The battery status screen shows how much
energy is left in the CR2450 battery. A fresh
battery is indicated by 6 zeros.
While the Aladin One periodically monitors
battery status, you can manually trigger a
status check with a press-and-hold of the
right button while in this screen.
The Aladin One’s intelligent battery
algorithm will limit some functions as you
near the end of the battery’s life. See
the table below for battery status and
corresponding function limitations.
Indicator in battery
status display
At other displays Battery status Function limitations
000000 Fresh battery none
_00000 Battery ok for diving none
__0000 Battery ok for diving none
___000 Battery symbol Weak battery, change
to fresh
Backlight not
operating
____00 Blinking battery symbol,
no dive symbol
Completely used battery,
change to fresh
Buzzer and backlight
not operating, diving
not recommended
_____0 Blinking battery symbol,
no dive symbol
Completely used battery,
change to fresh, Aladin
One may make a reset
any time and remain off
Diving mode not
allowed, only watch is
active. Settings cannot
be changed (OFF)
FNOTE: Battery capacity and
voltage at the end of a battery’s
lifetime may vary between battery
manufacturers. Generally, operation at
low temperatures decreases battery
capacity. Therefore, when the battery
indicator drops below 4 zeros, change
the battery to a fresh one before
making any new dives.
WARNING
When the battery is critically low, the watch
settings are disabled (the watch set menu is
“OFF”).

10
ALADIN ONE USER MANUAL
WARNING
• If the battery status graph shows only 2
zeros, the battery symbol will blink, both
on the surface and in dive mode, to alert
you of a dangerous situation. At this point
the battery may not have enough energy to
nish a dive. In such a case, audible alarms
and attention messages are disabled, the
backlight is deactivated, and you run the
risk of a computer malfunction. Do not let
the battery reach this condition!
• Always replace the battery when the steady
battery symbol appears (3 zeros).
FNOTE: Logbook information is not lost
even when the battery is removed for
an extended period of time.
2.2.8 Active backlight
The display of the Aladin One can be
illuminated both on the surface and under
water. The backlight can be activated with
a press-and-hold of the left button.
The light will turn off automatically after 6
seconds.
FNOTE: Repeated activation of the
backlight will reduce battery life.
The Aladin One monitors the battery
level throughout every dive, and if
the available energy drops below the
warning threshold, the Aladin One will
automatically disable the backlight to
prevent a computer shut-down.
2.2.9 Switching off the display
From the time of day display you can
switch off the Aladin One by pressing and
holding both buttons simultaneously. On
the surface the Aladin One switches off
automatically after 3 minutes of non-use.
2.2.10 Alarm clock
The alarm clock tone works only at the
surface.
If the alarm clock is “on” the time of day
display shows the alarm clock/transmit
symbol.
When the alarm is triggered, the alarm
clock/transmit symbol ashes and special
attention beeps sound for 30 seconds or
until you press a button.
2.3 SOS mode
SOS mode (lock duration 24 hours) and surface
interval from the dive

11
English
ALADIN ONE USER MANUAL
If you remain above a depth of 0.8m/3ft for
more than 3 minutes without observing a
prescribed decompression stop, the Aladin
One will automatically switch into SOS
mode after the dive and remain there for
24 hours. The dive will be entered in the
logbook with “SOS.”
Push the right button to see the “SOS”
symbol (the SOS mode will be unlocked
after 24 hours).
While in SOS mode, the Aladin One cannot
be used for diving.
FNOTE: Diving within 48 hours after
exiting SOS mode will result in
shorter no-stop times or longer
decompression stops.
WARNING
• Serious injury or death may result if you
do not seek immediate treatment should
any signs or symptoms of decompression
sickness occur after a dive.
• DO NOT dive to treat symptoms of
decompression sickness!
• Diving in SOS mode is extremely dangerous
and you must assume full responsibility for
such behavior. SCUBAPRO will assume no
liability.
FNOTE: A diving accident can be
analyzed at any time in the logbook
and downloaded to a PC by means of
the Bluetooth interface and LogTRAK
software.
3. DIVING WITH YOUR
ALADIN ONE
3.1 Terminology/Symbols
The information on the display of the Aladin
One varies depending on the kind of dive
and the dive phase.
3.1.1 General terminology/Display
during no-stop phase
CURRENT
DEPTH
In meters
(feet)
DIVE TIME
MAX DEPTH
(reached during the dive)
+ ALTERNATE DISPLAYS
(select by right button press)
O2 MIX (Until CNS%> 50%)
CNS% (After CNS%> 50%)
ASCENT RATE (During ascent)
NO STOP TIME
(Remaining
time at given
depth until
ascent without
decompression
stops is allowed)
No-stop phase
Dive phase during which surfacing is
allowed without stop.
Decompression phase
Dive phase during
which surfacing is
allowed only after
decompression stops
are completed.
Time
Current depth 24min
No-stop time
26.2m Max depth
37min dive time
Elapsed bottom time
Depth
3.1.2 Display during
decompression phase
DECOMPRESSION
SYMBOL
(Stops required)
DECOMPRESSION
DURATION
(in minutes at the
stop depth)
DECOMPRESSION
STOP DEPTH
(deepest stage shown)
O2 MIX
(Until CNS% >50%)
ASCENT RATE
(During ascent)
TOTAL ASCENT
TIME
(In minutes
including
decompression
stops)
MAX DEPTH
(reached during the dive)
+ ALTERNATE DISPLAYS
(select by right button press)

12
ALADIN ONE USER MANUAL
Total ascent time to surface (7min)
Time
35.7m
No-stop range Decompression range
Deepest
decompression
stop depth
2min
Decompression
stop duration
6m
3m
Depth
3.1.3 Nitrox information
(O2information)
For dives with compressed air in normal
recreational diving, nitrogen is the decisive
gas for decompression calculations. When
diving with nitrox, the risk of oxygen toxicity
rises with the increase of the fraction of
oxygen and the increase of depth; this can
limit dive time and max depth. The Aladin
One includes this in its calculations and
displays the necessary information:
O2% mix Fraction of oxygen: The fraction
of oxygen in the nitrox mixture can be set
between 21% (normal compressed air) and
50% in 1% increments. Your selected mix
will be the basis for all calculations.
ppO2max Maximum allowed partial
pressure of oxygen: The higher the
fraction of oxygen in the mixture, the
shallower the dive depth at which this value
of the partial pressure of oxygen is reached.
The depth at which the ppO2max is reached
is called Maximum Operating Depth (MOD).
When you enter the settings for the gas
mixture, the Aladin One will display the
ppO2maximum limit setting and the
corresponding MOD. The Aladin One warns
you audibly and visually once the depth,
at which the ppO2reaches the maximum
allowed value, is reached.
FNOTE: The default setting of ppO2max
is 1.4bar. The value of ppO2max can
be set between 1.0bar and 1.6bar at
the gas settings. The CNS O2% value/
alarm is not inuenced by the selected
ppO2max setting.
CNS O2% Oxygen toxicity: With the
increased percentage of oxygen, the
oxygen in the tissues, especially in the
central nervous system (CNS), becomes
important. If the partial pressure of oxygen
rises above 0.5bar, the CNS O2value
increases; if the partial pressure of oxygen is
below 0.5bar, the CNS O2value decreases.
The closer the CNS O2value is to 100%,
the closer the limit where symptoms of
oxygen toxicity can occur.
During the dive, the depth at which ppO2
reaches 0.5bar with various commonly-
used mixes is as follows:
MIX DEPTH in
meters
DEPTH in
feet
21% 13m 43ft
32% 6m 20ft
36% 4m 13ft
WARNING
Nitrox diving should only be attempted by
experienced divers after proper training from
an internationally recognized agency.
3.2 Attention messages and
alarms
The Aladin One draws the diver’s attention
to certain situations and warns of unsafe
diving practices. These attention messages
and alarms are visual and/or audible.
3.2.1 Attention messages
Attention messages are communicated
visually using symbols, letters or ashing
gures. In addition, 2 short audible
sequences can be heard (in an interval of
4 seconds) in 2 different frequencies under
water.
Attention messages come up in the
following situations:
• Maximum operating depth/ppO2max is
reached.
• Set max depth is reached.
• Oxygen toxicity reaches 75%.
• No-stop time is less than 3 minutes.
• Prohibited altitude (surface mode).
• Entering decompression.
• Half of set dive time is reached.
• Set dive time is reached.

13
English
ALADIN ONE USER MANUAL
3.2.2 Alarms
Alarms are provided visually by ashing
symbols, letters or gures. In addition, an
audible sequence in one frequency can be
heard during the whole duration of the alarm.
An alarm occurs in the following situations:
• Oxygen toxicity reaches 100%.
• Ignored decompression.
• Exceeding the prescribed ascent rate.
• Altitude alarm.
• Low battery alarm (without audible
alarm): battery icon appears if battery
has to be replaced.
FNOTE: Audible attention messages
can be switched off in the watch
settings mode (by pressing the right
button 5x to the sounds screen) or
in LogTRAK. With LogTRAK sounds
can be switched off selectively or
completely.
WARNING
If you turn off all sound you will have no
audible warnings. Without audible warnings
you could inadvertently nd yourself in
potentially hazardous situations which could
result in death or serious injury.
WARNING
Serious injury or death may result from failing
to immediately respond to alarms provided by
the Aladin One.
3.3 Preparation for the dive
It’s important to check the settings of the
Aladin One, especially before the rst dive.
All settings can be checked and changed
directly on the Aladin One or by using
LogTRAK and a PC.
3.3.1 Function check
To test the display, turn on your Aladin One
with a press-and-hold of the left button. Are
all elements of the display activated? Do
not use your Aladin One if the display does
not show all elements. (When switching on
the Aladin One with the right button the test
display will not appear.)
WARNING
Always check the battery capacity before each
dive. See chapter: System and Operation,
section: Check the battery.
3.3.2 Setting the gas mixture and
ppO2max
To set the gas mixture, the Aladin One must
be in the dive display (showing time of day,
temperature and gas percentage):
1. Press-and-hold the right button to get
to the GAS screen, then press-and-
hold the right button again to get to the
GAS1 O2menu.
2. Conrm that you wish to change the
oxygen fraction of gas 1 with a press-
and-hold of the right button.
3. By pressing either the left or right button
you can change the oxygen fraction in
increments of 1%. The Aladin One will
display the current fraction of oxygen,
the maximum partial pressure limit (ppO2
max) and the MOD.
4. Conrm your selected percentage with
a press-and-hold of the right button.
5. Next, by pushing the left or right button
you can change the ppO2max for your
chosen fraction of oxygen down to
1.0bar. The Aladin One will now display
the corresponding MOD for the new
ppO2max.
6. Conrm your ppO2max setting with a
press-and-hold of the right button.
FNOTE: Without conrmation via a
press-and-hold of the right button the
display will disappear after 3 minutes
and your entries will not be accepted.
Automatic reset of the O2% mix to
21% can be set between 1 and 48
hours or to “no reset” (default).

14
ALADIN ONE USER MANUAL
WARNING
Before every dive and after changing the tank,
make sure that the settings for the gas mixture
correspond to the current mixture being used.
An incorrect setting will cause the Aladin One
to miscalculate the dive. If the fraction of
oxygen is set too low, oxygen poisoning can
occur without warning. If the value is set too
high, decompression sickness may occur.
Inaccuracies in the calculations are carried
over to repetitive dives.
3.4 Functions during the dive
3.4.1 Alternate displays
By pushing the right button during the
dive you can scroll through the alternate
displays (Max depth > Temperature > Time,
Temperature).
You can get back to the rst display by:
• Scrolling with the right button through
the displays.
• Without taking any action, after 5
seconds the display automatically
switches back to the original display.
3.4.2 Dive time
All time spent below a depth of 0.8m/3ft is
displayed as dive time in minutes. The time
spent above 0.8m/3ft is counted as dive
time only if you once again descend below
0.8m/3ft within 5 minutes.
While the dive time is running, the colons
to the right of the gures are ashing in
1-second intervals.
The maximum dive time displayed is 199
minutes. If a dive lasts longer than 199
minutes the dive time display starts again
at 0 minutes.
FNOTE: Half time alarm (turn around
alarm): If half of the set maximum dive
time has elapsed, an audible signal will
sound and the symbol ashes for
1 minute.
When the set dive time has elapsed
an audible alarm sounds and the dive
time starts ashing.
3.4.3 Current depth/O2% mix
Current depth is given in 10cm increments
in the metric setting and 1ft increments in
the imperial setting.
Current depth
Oxygen mix
At a diving depth of less than 0.8m/3ft the display
shows “ – – – “.
3.4.4 Max depth/Temperature
Max depth CNS O2%
Max depth is displayed only if it exceeds
the current depth by more than 1m/3ft
(maximum indicator function). In the
absence of max depth the Aladin One
displays temperature.

15
English
ALADIN ONE USER MANUAL
The O2% mix is displayed as long as the
CNS O2% is less than 50%. More than 50%
and the CNS O2% is displayed.
3.4.5 Set max depth reached
WARNING
If the set max depth has been reached (default
40m/130ft) and the depth alarm is turned on,
the alarm tone sounds and the depth display
ashes. Ascend until the depth stops ashing.
3.4.6 Ascent rate
Too fast
ascent
indicator
Ascent rate
Optimal ascent rate varies depending on
depth between 7 and 20m/min (23 and
67ft/min). It is displayed as a percent of
the reference variable ascent rate. If the
ascent rate is greater than 100% of the set
value, the vertical black arrow with “SLOW”
appears. If the ascent rate exceeds 140%,
the arrow starts ashing.
The Aladin One provides an audible alarm
if the ascent rate is 110% or greater. The
intensity of the alarm increases in direct
proportion to the degree that the prescribed
ascent rate is exceeded.
WARNING
The prescribed ascent rate must be observed
at all times! Exceeding the prescribed ascent
rate can lead to microbubbles in the arterial
circulation which can lead to serious injury or
death due to decompression sickness.
• In case of an improper ascent the Aladin
One may require a decompression stop,
even within the no-stop phase, because
of the danger of microbubble formation.
• The decompression duration necessary
for the prevention of microbubbles can
increase massively if the ascent rate is
exceeded.
• From great depths a slow ascent may
cause heightened saturation of tissues
and an extension of both decompression
duration and total ascent time. At shallow
depths, a slow ascent may shorten the
decompression duration.
• Display of the ascent rate has the
priority over “CNS O2”.
Excessive ascent rates for longer periods
are entered in the logbook. The following
ascent rates correspond to the 100% value
in the Aladin One.
DEPTH ASC SPEED
m ft m/min ft/min
0 0 7 23
6 20 8 26
12 40 9 29
18 60 10 33
23 75 11 36
27 88 13 43
31 101 15 49
35 115 17 56
39 128 18 59
44 144 19 62
50 164 20 66

16
ALADIN ONE USER MANUAL
3.4.7 Partial pressure of oxygen
(ppO2max)/Maximum
operating depth (MOD)
The maximum partial pressure of oxygen
(ppO2max), with a default of 1.4bar,
determines the Maximum Operating Depth
(MOD). Diving deeper than the MOD
exposes you to oxygen partial pressures
higher than the set maximum level.
The ppO2max, and consequently the MOD,
can be reduced manually when setting the
gas. See chapter: Settings, section: Gas
menu.
WARNING
The MOD is a function of ppO2max and the
mixture used. If during the dive the MOD is
reached or exceeded, the Aladin One sends
an audible attention message and the MOD is
displayed (ashing) in the lower left corner. If
this occurs, ascend to a depth shallower than
the displayed MOD in order to diminish the
danger of oxygen poisoning.
WARNING
The MOD should not be exceeded. Disregarding
the warning can lead to oxygen poisoning.
3.4.8 Oxygen toxicity (CNS O2%)
The Aladin One calculates oxygen toxicity
based on depth, time and gas mixture,
and displays it in the lower right corner
when the value is greater than 50%. The
toxicity is expressed in 1% increments of a
maximum tolerated value (CNS O2clock).
The symbol “CNS O2” is displayed together
with the percentage.
WARNING
An audible attention signal starts if oxygen
toxicity reaches 75%. The symbol “CNS O2%”
ashes.
Ascend to a shallower depth to decrease oxygen
loading, and consider terminating the dive.
WARNING
When oxygen toxicity reaches 100%, an audible
alarm sounds every 4 seconds. “CNS O2” and
the percentage value ash, indicating the
danger of oxygen toxicity! Start procedure for
terminating the dive.
FNOTE:
• During an ascent, and if the CNS O2%
value does not increase (due to a
lower partial pressure of oxygen), the
audible warning is suppressed.

17
English
ALADIN ONE USER MANUAL
• During an ascent, the display of the
oxygen toxicity is replaced by the
ascent rate. If the ascent is stopped,
the display changes back to the
indication of the CNS value.
• The Aladin One displays CNS O2%
values exceeding 199% with 199%.
• The Aladin One displays CNS O2%
values above 50%.
3.4.9 Decompression information
NO STOP and the no-stop time (in minutes)
are displayed if no decompression stops
are necessary.
No-stop time
FNOTE:
• A no-stop display of “99:” means
there is remaining time of 99 minutes
or more.
• No-stop time is influenced by the
water temperature.
WARNING
If no-stop time drops below 3 minutes, an
audible attention signal is activated and the
no-stop value begins to ash. If no-stop time
is less than 1 minute, the no-stop display
shows the ashing value “0”.
In order to prevent a decompression dive,
ascend slowly until the no-stop time is 5
minutes or more.
WARNING
Decompression diving requires advanced
training from a recognized agency. Do not
attempt decompression diving without proper
training from a recognized agency.
3.4.10 Decompression values
Decompression
obligation
Decompression
stop duration
Decompression
depth
On entering the decompression phase,
“NO STOP” disappears, “DECO” appears
and the audible attention beep sounds. The
“STOP” arrow appears next to the “DECO”
symbol when the diver is at decompression
range (1.5m / 5ft below the stop).
The deepest decompression stage
in meters/feet is displayed and the
decompression stop duration of the
displayed stage appears in minutes.
The display “7: 3m” means that a
decompression stop of 7 minutes at a
depth of 3m/10ft has to be made.
When a decompression stop has
been completed, the next (shallower)
decompression stop is displayed.
When all decompression stops have been
completed, the “DECO STOP” symbol
disappears and the “NO STOP” symbol
along with the no-stop time reappears.
Deco stop depths deeper than 27m/90ft
are displayed as “ – – : – – ”.
Ignored decompression alarm

18
ALADIN ONE USER MANUAL
WARNING
The decompression alarm is activated if the
decompression stop is ignored. The “DECO
STOP” arrow, the decompression stop duration,
and the decompression stop depth begin to
ash and an audible alarm sounds. Due to the
formation of microbubbles, decompression
can increase massively if a decompression
stop is ignored. Descend to the prescribed
decompression stop depth immediately!
When the surface is reached during the
decompression alarm, the “DECO STOP”
arrow, the decompression stop duration,
and decompression stop depth continue
ashing in order to point to the risk of a
decompression accident. The SOS mode
is activated 3 minutes after the dive if
corrective action is not taken. If the total
(cumulative) duration of the decompression
alarm is longer than one minute, it is
entered in the logbook.
3.4.11 Total ascent time
Total Ascent
Time
As soon as decompression stops are
necessary, the Aladin One shows the total
time of ascent. This includes the ascent time
from the current depth to the surface as well
as all decompression stop obligations.
FNOTE: The total time of ascent
is calculated on the basis of the
prescribed ascent rate. Total time of
ascent can be subject to change if
the ascent rate is not ideal (100%).
Ascent time greater than 99 minutes
is displayed as “ – – ”.
WARNING
On all dives with the Aladin One, make a safety
stop for at least 3 minutes at a depth of 5m/15ft.
3.4.12 Safety stop timer
Safety Stop Icon Safety stop time (minutes, seconds)
The safety stop timer displays the time a
diver should spend at the safety stop depth
at the end of the dive. The timer starts
automatically when depth is shallower than
5m/15ft and counts back from 3 minutes
(default) to zero. It can be restarted manually
any number of times. The duration of the
timer can be set between 1 and 5 minutes.
The safety stop timer will be activated
under the following conditions: depth
<5m/15ft; no-stop display of 99 min; stop
time is selected (1-5 min) in the scuba
mode menu.
You can activate the safety stop timer by
pressing the left button. The timer begins
to count backwards. If you press again, the
timer will start again from the full value.
The safety stop timer will switch off
automatically if the depth exceeds
6.5m/21ft or the no-stop phase is shorter
than 99 minutes.
3.5 Functions after the dive
3.5.1 End of a dive
After reaching the surface (<0.8m/3ft) the
Aladin One remains in dive mode for 5

19
English
ALADIN ONE USER MANUAL
minutes. The delay allows for surfacing for
a short period for orientation.
After 5 minutes, the dive is closed and is
entered into the logbook. The desaturation
time, the no-y time, the no-dive warning
(if applicable), the current altitude class and
the prohibited altitude class are displayed
for 3 minutes, after which the computer
turns off.
WARNING
For calculations of desaturation and no-y time
it is assumed that you are breathing air while
on the surface.
3.5.2 Desaturation time, No-y
time and No-dive warning
Desaturation time
Ascent to altitude 2
prohibited
No-dive warning Do not fly icon No fly time
5 minutes after a dive the Aladin One shows
the desaturation time, the no-y time, the
no-dive warning (if applicable), the current
altitude class and the prohibited altitude
class – see chapter: Diving with your
Aladin One, section: Prohibited altitude.
No-y time is the time in hours that should
pass before ying. It is displayed until the
value counts down to 0 hours.
WARNING
Flying while the Aladin One displays the “do
not y” icon may lead to serious injury or death
from decompression sickness.
WARNING
If the “no-dive” warning is visible during the
surface interval, you should not undertake
another dive.
To check the elapsed surface interval and
oxygen toxicity, press-and-hold the right
button.
Surface interval
Oxygen toxicity
Desaturation time is determined either by
oxygen toxicity, nitrogen saturation or the
regression of microbubbles, depending on
which requires the longer time.
No-dive warning
If the Aladin One detects a situation of
increased risk (due to the potential of
microbubble accumulation from previous
dives or a CNS O2level above 40%), the
“no-dive” symbol will appear on the display.
The duration of the no-dive warning is
visible in the dive planner menu. The Aladin
One recommends this as a minimum
surface interval in order to reduce the
number of microbubbles and/or to reduce
the CNS O2level below 40%.
FNOTE: You should not undertake a
dive as long as the no-dive warning
message is displayed on the computer
screen. If the warning is prompted
by microbubble accumulation (as
opposed to CNS O2over 40%) and you
dive anyway, you will have shorter no-
stop times or longer decompression
times. Moreover, the duration of the
no-dive warning at the end of the dive
can increase considerably.

20
ALADIN ONE USER MANUAL
3.6 Diving in mountain lakes
3.6.1 Altitude classes
The Aladin One measures the atmospheric pressure every 60 seconds, even while the
display is switched off. If the computer detects a sufcient increase in altitude, it switches
on automatically and indicates the new altitude class (1-4) and the desaturation time.
Desaturation time indicated at this moment refers to the adaptation time at this altitude. If
the dive starts within this adaptation time, the Aladin One treats it as a repetitive dive, since
the body is off-gassing.
Altitude is divided into 5 classes, which are inuenced by barometric pressure. That is why
the dened altitude classes overlap on their fringes. If a mountain lake is reached, the altitude
class is indicated at the surface (time of day display), in the logbook and in the dive planner
with a stylized mountain icon and the current altitude class. The altitude from sea level to
approximately 1000m/3280ft is not indicated. In the following diagram, you can see the
approximate breakdown of the altitude classes:
Altitude Class Elevation Barometric
switch point Dive computer mode
GAUGE
(no deco data)
SCUBA
SCUBA
SCUBA
SCUBA
3.6.2 Prohibited altitude
Ascent to altitude class 3 and 4 is
prohibited. Maximum allowed altitude:
2650m/8694ft.
WARNING
At the surface, the Aladin One shows, via ashing
altitude class number, the altitude to which you
may not rise. The ascent prohibition is displayed
together with the current altitude class.
Example:
You are at 1200m/3937ft (altitude class
1) and you may ascend to class 2 only
(2650m/8694ft). You may not rise to the
altitude classes 3 or 4.
WARNING
If an ascent to a prohibited altitude is detected,
an audible alarm sounds for 1 minute. Descend
to a lower altitude.
3.6.3 Decompression dives in
mountain lakes
In order to assure optimal decompression
even at higher altitudes, the 3m/10ft
decompression stage is divided into a
4m/13ft stage and a 2m/7ft stage in
altitude classes 1, 2 and 3. The prescribed
decompression stop depths are in sequence
(2m/7ft, 4m/13ft, 6m/20ft, 9m/30ft…).
If atmospheric pressure is below
620mbar/8.99psi (altitude higher than
4100m/13450ft above sea level), no
decompression data is calculated and
displayed (automatic gauge mode). In
addition, the dive planner is no longer
available.