Oceanic Watch / Dive Computer GEO User manual

GEO
Watch / Dive Computer
operating manual

2
FULL LCD
Components:
a. Mode (M) Button
b. Select (S) Button
c. Light (L) Button
d. Advance (A) Button
e. LED Wa ning Light
f. Ba G aph
g. Icon - Log Mode
h. Icon - Ascend
i. Icon - Su face Inte val
O2 Time Remaining
No Deco Time Remaining
Total Ascent Time
FO2 Set Point
j. Icon - Deg ees
k. Icon - Stop Time Requi ed
Elapsed Dive Time
l. Icon - PO2
m. Icon - Nit ox
n. Icon - Daily Ala m set
o. Icon - Low Batte y
p Icon - Depth/Max Depth
q. Icon - Descend
b
c
d
e
g
h
j
k
l
q
o
m
i
p
a
f
n

3
CONTENTS
FULL LCD .............................................................................................................................................................. 2
WARRANTY, NOTICES, DECOMPRESSION MODEL ..........................................................................................7
INITIAL ACTIVATION .............................................................................................................................................. 8
INTRODUCTION AND GENERAL FEATURES AND DISPLAYS ........................................................................... 9
INTERACTIVE CONTROL CONSOLE ............................................................................................................. 10
OPERATING MODE STRUCTURE .................................................................................................................. 11
OPERATION AS A DIVE COMPUTER ............................................................................................................. 12
PC INTERFACE ................................................................................................................................................ 13
SYMBOLS AND ALPHA NUMERIC GRAPHICS .............................................................................................. 13
AUDIBLE ALARM ............................................................................................................................................. 13
BAC LIGHT ..................................................................................................................................................... 15
POWER SUPPLY ............................................................................................................................................. 16
WATCH FEATURES AND DISPLAYS ................................................................................................................... 17
LOCAL DEFAULT TIME ................................................................................................................................... 18
MAIN TIME ....................................................................................................................................................... 19
SET MAIN TIME ............................................................................................................................................ 20
ALTERNATE TIME ........................................................................................................................................... 23
SET ALTERNATE TIME ................................................................................................................................ 24
COUNTDOWN TIMER ...................................................................................................................................... 25
SET COUNTDOWN TIMER .......................................................................................................................... 25
CHRONOGRAPH ............................................................................................................................................. 27
DAILY ALARM .................................................................................................................................................. 28
SET DAILY ALARM ....................................................................................................................................... 29
DIVE COMPUTER FEATURES AND DISPLAYS ................................................................................................. 31
BAR GRAPH .................................................................................................................................................... 32
ALPHA / NUMERIC DISPLAYS ....................................................................................................................... 34
Depth Displays .............................................................................................................................................. 4
Time and Date Displays ................................................................................................................................ 4
Temperature Display ..................................................................................................................................... 5

4
CONTENTS (continued)
DIVE COMPUTER SURFACE SEQUENCE AND OPERATING MODES ............................................................. 37
DC OPERATING MODES ................................................................................................................................. 38
SURFACE MODE ............................................................................................................................................. 38
NORM Surface Mode .................................................................................................................................... 40
NORM AND GAUG SURFACE SET MODES ................................................................................................... 43
Set F Group (FO2) ....................................................................................................................................... 4
Setting FO2 for Nitrox Dives ......................................................................................................................... 44
Set FO2 50% Default .................................................................................................................................... 46
Set A Group (NORM/GAUG Alarms) ........................................................................................................... 47
Set Audible Alarm .......................................................................................................................................... 47
Set Depth Alarm ............................................................................................................................................ 48
Set EDT (Elapsed Dive Time) Alarm ............................................................................................................. 49
Set TLBG (Tissue Loading Bar Graph) Alarm ............................................................................................... 50
Set DTR (Dive Time Remaining) Alarm ......................................................................................................... 51
Set PO2 Alarm .............................................................................................................................................. 52
Set U Group (Utilities) ................................................................................................................................. 53
Set Wet Activation ......................................................................................................................................... 54
Set Units ....................................................................................................................................................... 54
Set Safety Stop ............................................................................................................................................. 55
Set Conservative Factor ................................................................................................................................ 56
Set Backlight Duration ................................................................................................................................... 57
Set Sampling Rate ........................................................................................................................................ 58
SERIAL NUMBER ........................................................................................................................................ 58
PLAN Mode .................................................................................................................................................. 59
FLY Mode ..................................................................................................................................................... 62
DESAT Mode ................................................................................................................................................ 63
LOG Mode .................................................................................................................................................... 64
HISTORY Mode ............................................................................................................................................ 69

5
CONTENTS (continued)
OVERVIEW OF DIVE MODE INFORMATION ...................................................................................................... 71
DISPLAYED SYMBOLS AND ICONS .............................................................................................................. 72
DIVE TIME REMAINING (DTR) ........................................................................................................................ 73
No Decompression DTR (NDC) .................................................................................................................... 7
O2 DTR (OTR) .............................................................................................................................................. 74
VARIABLE ASCENT RATE .............................................................................................................................. 75
ELAPSED DIVE TIME (EDT) ............................................................................................................................ 76
CONTROL OF DISPLAYS ................................................................................................................................ 76
NORM TYPE DIVE MODES ................................................................................................................................. 77
WET ACTIVATION CONTACTS ....................................................................................................................... 78
NORM NO DECOMPRESSION DIVE MODE ................................................................................................... 79
No Deco Safety Stop ..................................................................................................................................... 81
DECOMPRESSION DIVE MODE ..................................................................................................................... 83
VIOLATION MODES ......................................................................................................................................... 86
Conditional Violation ...................................................................................................................................... 86
Delayed Violation #1 ..................................................................................................................................... 87
Delayed Violation #2 ..................................................................................................................................... 88
Delayed Violation # ..................................................................................................................................... 88
Immediate Violation and Violation Gauge Mode ............................................................................................ 89
HIGH PO2 ......................................................................................................................................................... 91
HIGH OXYGEN ACCUMULATION ................................................................................................................... 92
SUMMARY OF WARNING AND ALARM MESSAGES ..................................................................................... 93
NORM POST DIVE MODES ................................................................................................................................. 95
TRANSITION PERIOD ..................................................................................................................................... 96
AFTER THE TRANSITION PERIOD ................................................................................................................. 97
UPLOADING SETTINGS AND DOWNLOADING DATA .................................................................................. 99
PC Compatibility Requirements .................................................................................................................. 100
GAUGE OPERATING MODE ............................................................................................................................. 101
GAUGE MODE ............................................................................................................................................... 102

6
CONTENTS (continued)
FREE DIVE OPERATING MODE ....................................................................................................................... 105
FREE Surface Mode ................................................................................................................................... 106
FREE CDT (COUNTDOWN TIMER) .............................................................................................................. 108
Set FREE CDT ............................................................................................................................................ 110
FREE EDT (ELAPSED DIVE TIME) ALARM .................................................................................................. 111
Set FREE EDT Alarm .................................................................................................................................. 111
FREE DEPTH ALARMS (FDA) ....................................................................................................................... 112
Set FDA1 .................................................................................................................................................... 11
Set FDA2 .................................................................................................................................................... 114
Set FDA .................................................................................................................................................... 115
FREE DIVE MODE ......................................................................................................................................... 116
FREE Dive CDT .......................................................................................................................................... 117
FREE Dive Alarms ...................................................................................................................................... 117
REFERENCE ...................................................................................................................................................... 121
CARE AND CLEANING .................................................................................................................................. 122
INSPECTIONS AND SERVICE ....................................................................................................................... 122
BATTERY REPLACEMENT ........................................................................................................................... 123
ALTITUDE SENSING AND ADJUSTMENT .................................................................................................... 128
No Decompression Limits at Altitude ........................................................................................................... 129
OXYGEN EXPOSURE LIMITS ....................................................................................................................... 130
SPECIFICATIONS .......................................................................................................................................... 131
ERROR (RESET DURING A DIVE) ................................................................................................................ 137
INSPECTION / SERVICE RECORD ............................................................................................................... 138
OCEANIC WORLDWIDE ................................................................................................................................ 139
Pay special attention to items marked
with this Warning symbol.

7
LIMITED TWO-YEAR WARRANTY
For details, refer to the Product Warranty Registration Card provided. Register on-line at
www.OceanicWorldwide.com
COPYRIGHT NOTICE
This operating manual is copyrighted, all rights are reserved. It may not, in whole or in part, be
copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine
readable form without prior consent in writing from Oceanic / 2002 Design.
GEO Operating Manual, Doc. No. 12-2734
© 2002 Design, 2006
San Leandro, CA USA 94577
TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE
Oceanic, the Oceanic logotype, the Oceanic 'O' symbol, GEO, the GEO logo, Diver Replace-
able Batteries, Graphic Diver Interface, Tissue Loading Bar Graph (TLBG), Pre Dive Planning
Sequence (PDPS), Set Point, Control Console, and OceanLog are all registered and unregistered
trademarks , trade names, and service marks of Oceanic. All rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Data Sensing and Processing Device (U.S. Patent no. 4,882,678). Other patents pending.
User Setable Display (U.S. Patent no. 5,845,235) is owned by Suunto Oy (Finland).
DECOMPRESSION MODEL
The programs within the GEO simulate the absorption of nitrogen into the body by using a
mathematical model. This model is merely a way to apply a limited set of data to a large range
of experiences. The GEO dive computer model is based upon the latest research and experi-
ments in decompression theory. Still, using the GEO, just as using the U.S. Navy (or
other) No Decompression Tables, is no guarantee of avoiding decompression
sickness, i.e. the bends. Every divers physiology is different, and can even vary from
day to day. No machine can predict how your body will react to a particular dive profile.

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GEO Watch/Dive Computers are placed in a Deep Sleep mode prior to being
shipped from the factory. The intent is to extend storage life of the Battery for up
to 7 years, before the unit is initially placed in service.
In this mode, Date and Time are updated as they normally would be. However,
they are not displayed. Upon waking the GEO up, the correct Date and U.S.
Pacific Time will be displayed and it will be ready to operate with full functions.
To wake the GEO up from Deep Sleep mode, simultaneously depress the upper/
right (S) and lower/left (A) buttons for 2 to 3 seconds until the display comes full
ON displaying the MAIN TIME screen, then release them.
NOTE: Once the GEO is brought out of the Deep Sleep mode, it
can only be placed back in it by the factory.
NOTICE
STORAGE and INITIAL ACTIVATION

9
WARNING: Prior to diving with the GEO, you must also
read and understand the Oceanic Dive Computer Safety and
Reference Manual, Doc. No. 12-2262, which provides
Important Warnings and Safety Recommendations as well
as general product information.
INTRODUCTION
AND
GENERAL FEATURES AND DISPLAYS

10
INTRODUCTION
Welcome to OCEANIC and thank you for choosing the GEO !
It is extremely important that you read this Operating Manual in sequence and
understand it completely before attempting to use the GEO as a dive computer.
It is equally important that you read the Oceanic Dive Computer Safety and
Reference Manual (Doc. No. 12-2262) provided with your GEO. It contains
information that you must become familiar with prior to diving with your GEO.
Remember that technology is no substitute for common sense, and a dive computer
only provides the person using it with data, not the knowledge to use it.
INTERACTIVE CONTROL CONSOLE
The Interactive Control Console consists of four Control Buttons that allow you to
select mode options and access specific information. They are also used to link
the Transmitter(s), enter Settings, activate the Backlight, and acknowledge the
Audible Alarm.
Throughout this manual they will be referred to as the M, S, L, and A buttons.
 Upper/Left - Mode (M) button
 Upper/Right - Select (S) button
 Lower/Right - Light (L) button
 Lower/Left - Advance (A) button
M
A
S
L

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OPERATING MODE STRUCTURE
Unless it is operating in Dive Computer mode, the GEO will be
ON in the default WATCH MAIN TIME (home time) mode (Fig.
1), like a standard WATCH, until the Mode is changed.
The M button is used to access 4 other Modes that include
Alternate Time Mode, Countdown Timer, Chronograph (stop
watch/lap timer), and Daily Alarm. It is also used to revert to
the Local Default Time display and access Computer Modes.
The screens of the Main Modes and Sub Modes will remain on
display until a button is pressed to access another screen or
Mode, activate a sequence, or for 2 minutes if no button is
pressed. The Chronograph remains on display as long as it is
running unless another Mode is accessed.
When Wet Activation is set On, the GEO will enter selected
Dive Mode upon descent to 5 FT (feet)/1.5 M (meters) for 5
seconds, regardless of what operating Mode it is in.
WARNING: When Wet Activation is set OFF,
the GEO must be in Dive Surface Mode
(NORM< GAUG, or FREE prior to the first dive
of a new series. Commencing a dive while in
Watch modes will not activate Dive Mode
unless Wet Activation is set ON.
Main Sequence
(while at home)
Main Time
Alternate Time
Countdown Timer
Chronograph
Daily Alarm
Alternate Sequence
(at a travel location)
Alternate Time
Main Time (home)
Countdown Timer
Chronograph
Daily Alarm
Fig. 1 - MAIN TIME

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OPERATION AS A DIVE COMPUTER
The GEO features 3 Dive Computer (DC) Operating Modes,
NORM (Fig. 2A) which is used for Air and Nitrox dives,
GAUG (Fig. 2B) used for dives in which Nitrogen-Oxygen
calculations are not performed, and FREE (Fig. 2C) used for
activities that do not use SCUBA.
Entering Settings and Plan Mode are only available in NORM
SURF Mode which also allows access to Fly, Desat, Log, and
History Modes.
GAUG Mode only allows access to Fly, Log, and History
Modes.
Once a dive is made in GAUG Operating Mode, the GEO is
locked into that Mode for 24 hours after the dive.
PC INTERFACE
Interface with a PC is accomplished by connecting the GEO to
a PC USB Port using the OceanLog USB Interface Cable. The
same Cable is used for Upload and Download.
The software program is on the OceanLog CD, together with a
USB Driver. The program's Help serves as the user manual
and can be printed for personal use. The Settings Upload
program is used to check the GEO's existing Settings and for
entering Time, Alarm, and Dive Computer settings into the
GEO.
Fig. 2 - DC MODES
2A
2B
2C

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The Data Download program is used to retrieve Data that was sampled during
dives and stored in the GEO's memory.
The GEO checks for an External Access request once every second while in the
Watch Main Time. Checks are not made if the unit is wet. For a connection to be
made, the Interface Cable is clipped onto the GEO's Data Port and plugged into a
PC USB Port. To establish the connection, the PC program must be running.
When the connection is made, all segments of the LCD appear on the display until
completion of the Upload or Download operation.
 The GEO reverts to the Watch Main Time screen after completion of the
Upload or Download operation, or after 2 minutes if no PC action was taken.
SYMBOLS AND ALPHA NUMERIC GRAPHICS
The upper line of digits on the LCD screen is used to convey alpha Messages such
as Day of the Week, Operating Modes, items being Set, Altitude level, and Alarm
identification. At times, the second line is also used to display alpha numeric
graphics such as FO2 and On/Off. The PO2 values will appear in the lower
line.
AUDIBLE ALARM
Most warning situations that activate the Audible Alarm while operating in NORM
or GAUG Mode cause the GEO to emit 1 beep per second for 10 seconds, or
until the situation is corrected, or it is acknowledged by momentarily pressing and
releasing the S button (less than 2 seconds). After being acknowledged and the
situation corrected, the Alarm will sound again upon reentry into the warning
situation, or entry into another type of warning situation.

14
FREE Dive Mode has its own set of Alarms which emit 3 short beeps either 1 or 3
times which cannot be acknowledged or set Off.
A red LED Warning Light, located on the left side of the housing, is synchronized
with the Audible Alarm. It will flash as the Audible Alarm sounds. It will turn Off
when the Alarm is acknowledged or the situation is corrected. The Audible and
LED will not be active if the Alarm is Set OFF (a group A setting).
Situations that will activate the NORM/GAUG 10 second Alarm include -
 Descent deeper than the Max Depth Set Point selected.
 Dive Time Remaining at the Set Point selected.
 Elapsed Dive Time at the Set Point selected.
 High PO2 at the Set Point selected.
 High O2 of 300 OTU (single or daily exposure).
 Tissue Loading Bar Graph at the segment Set Point selected.
 NORM/GAUG Ascent Rate exceeds 60 FPM (18 MPM) when deeper than
60 FT (18 M), or 30 FPM (9 MPM) at 60 FT (18 M) and shallower.
 Entry into Decompression Mode (Deco).
 Conditional Violation (above a required Deco Stop Depth for less than 5
minutes).
 Delayed Violation (above a required Deco Stop Depth for more than 5
minutes).
 Delayed Violation (a Deco Stop Depth greater than 60 FT/18 M is required).
 Delayed Violation (Maximum Operating Depth of 330 FT/100 M is
exceeded).
 Watch Daily Alarm reaches time set (disabled during Dive Modes).
 Watch Mode Countdown Timer reaches 0:00.

15
A single short beep (which cannot be disabled) is emitted for the following -
 Upon completion of a Hot Swap battery change.
 Change from Delayed to Full Violation 5 minutes after the dive.
3 short beeps (which cannot be disabled) are emitted for the following -
 NORM/GAUG Ascent Rate is 51 to 60 FPM (15.1 to 18 MPM) when deeper
than 60 FT (18 M), or 26 to 30 FPM (7.5 to 9 MPM) at 60 FT (18 M) and
shallower.
 FREE Elapsed Dive Time Alarm (3 beeps every 30 seconds if set On).
 FREE Depth Alarms 1/2/3 (set sequentially deeper) - each 3 beeps 3 times.
 FREE TLBG Alarm (Caution zone, 4 segments) - 3 beeps 3 times.
 Entry into Deco during a FREE Dive (Permanent Violation) - 3 beeps 3 times.
 Free Dive Mode Countdown Timer reaches 0:00 - each 3 beeps 3 times.
During the following NORM Dive situations, the 10 second continuous tone will be
followed by a 5 second steady beep that will not turn off when acknowledged -
 Ascending above a required Decompression Ceiling Stop Depth for more
than 5 minutes (referred to as a Delayed Violation).
 Decompression requires a Ceiling Stop Depth of 70 FT (21 M) or deeper.
 Being on the Surface for 5 minutes after a Conditional Violation (Permanent
Violation).
BACKLIGHT
To activate the Backlight - press the L button.
 The Backlight will activate and illuminate the display for button depression
time (10 seconds maximum) plus the user set Duration time of 0, 5, or 10
seconds, for a maximum of 20 seconds.
 Press the button again to activate as desired.

16
NOTE: Extensive use of the Backlight reduces
estimated Battery life. Also, the Backlight
does not operate during a Low Battery Condi-
tion or when the GEO is connected to a PC.
POWER SUPPLY
The GEO utilizes one 3 volt CR2430 Lithium Battery. When
used as a Dive Computer, the battery should operate normally
for 1 year or 300 dive hours if 2 dives are conducted during
each dive period. The GEO checks its battery voltage every 2
minutes during surface operation.
 If voltage decreases to the Warning level (2.75 volts), the
Battery icon will appear on Surface display screens (fig.
3a) as an indication that the Battery should be changed
prior to commencing a series of dives.
 If voltage decreases to the Alarm level (2.50 volts), the
Battery icon will flash and the message CHNG > BATT
will scroll at the top of the display (Fig. 4). Operation will
automatically revert to Main Time Mode. The GEO would
then only operate in Watch modes until the Battery
becomes completely depleted.
 Low Battery Warning/Alarm conditions are not displayed
during Dive Modes.
 If a Low Battery Condition was not displayed prior to
starting a Dive, and a Low Battery Condition occurs
during the dive, there will be sufficient Battery power to
maintain operation for the remainder of that dive.
Fig. 4 - LOW BATTERY
ALARM
Fig. - LOW BATTERY
WARNING
a

17
WATCH
FEATURES AND DISPLAYS
WARNING: Prior to diving with the GEO, you must also
read and understand the Oceanic Dive Computer Safety and
Reference Manual, Doc. No. 12-2262, which provides
Important Warnings and Safety Recommendations as well
as general product information.

18
LOCAL DEFAULT TIME
Watch Main Time (Fig. 5) is the current Time at your home
location and is normally selected as the Local Default Time.
The normal Watch screen sequence accessed with momentary
presses (less than 2 seconds each) of the M button is -
Main Time > Alternate Time > Countdown Timer >
Chronograph > Daily Alarm
Watch Alternate Time (Fig. 6), which is set by Hour
Differential, is the current Time at a remote travel location.
Upon arrival at the location, Alternate Time can be inter-
changed with Main Time to make it the Local Default Time
while visiting the travel location.
The M button will then access the screens in this sequence -
Alternate Time > Main Time > Countdown Timer >
Chronograph > Daily Alarm
While viewing Alternate Time, depressing and holding the S
button for 2 seconds will replace Main Time with Alternate
Time that will then become the Local Default Time until
changed.
Fig. 5 - MAIN TIME
Fig. 6 - ALTERNATE
TIME
TIME for the Remote
Location will display
Am (or Pm). Local
Default TIME will
not.

19
While viewing any of the Watch Mode displays, pressing and
holding the M button for 2 seconds or if no button is pressed
for 2 minutes, operation will revert to the Watch Time screen
selected to be the Local Default Watch Time (Main or Alter-
nate).
MAIN TIME, information displayed includes:
> Tissue Loading Bar Graph, if any after NORM/FREE dives.
> Alarm icon - if the Daily Alarm is set On (Fig. 7a)
> Day of the Week graphic MON (or TUE, WED, THU, FRI,
SAT, SUN), or the graphic WET (if the unit is wet).
> Battery icon - if a Low Battery Condition exists.
> Month and Day (Day and Month if set for Metric)
> Time of Day (hours, minutes, seconds) (Fig. 7b)
 Pressing and releasing the M button momentarily and
repeatedly (< 2 seconds each time) will step through the
Main Modes.
 Pressing and releasing the S button (< 2 seconds) will
silence and acknowledge the Daily Alarm (if set On and it
sounds).
 Pressing the L button will activate the Backlight.
 Pressing both the A and S buttons simultaneously for 2
seconds will access the SET MAIN TIME Mode.
Fig. 7 - MAIN TIME
(May 1)
a
b

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SET MAIN TIME
This Mode allows the Date and Time of Day to be set which
will also serve as the basis for ALTERNATE TIME values.
There are 3 Time Set screens - Set Hour Format, Set Time of
Day, and Set Date.
NOTE: MAIN TIME must be selected as the
Local Default Time in order to set the Time and
Date.
Sequence of Time/Date settings:
Hour Format > Hour > Minute > Year > Month > Day
Day of the Week is set automatically when the Date is set.
 Depressing and holding the M button at any time for 2
seconds or if no button is pressed during a period of 2
minutes, the unit will revert to the MAIN TIME screen.
While the MAIN TIME screen is being displayed, pressing the
A and S buttons simultaneously for 2 seconds will access the
Set Hour Format screen displaying the graphic HOUR, symbol
TIME, and the Hour Format Set Point 12 or 24 flashing (Fig. 8).
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle the setting between 12 and 24.
Fig. 8 - SET HOUR
FORMAT