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GEO 4.0
Operating Manual
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Oceanic GEO 4.0 Operating Manual

GEO 4.0 OPERATING MANUAL
GEO 4.0
DIVE COMPUTER
OPERATING MANUAL
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
1
CONTENTS
GEO 4.0 OPERATING MANUAL
GETTING STARTED 6
WATCH MODE 12
DIVE FEATURES 19
NORM SURFACE MODE 24
NORM DIVE MODE 36
HIGH O
2
ALARM 42 PO
DURING DECOMPRESSION 42
2
SAT (OXYGEN SATURATION) 43
2
WARNING 43 ALARM 43 WARNING DURING DECOMPRESSION 43 ALARM DURING DECOMPRESSION 43 ALARM ON SURFACE 44
42
GAUGE MODE 45
FREE MODE 49
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
2
REFERENCE 55
GEO 4.0 OPERATING MANUAL
TECHNICAL DATA 59
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
3
GEO 4.0 OPERATING MANUAL
NOTICES
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 either Oceanic or Pelagic.
Geo 4.0 Operating Manual, Doc. No. 12-5670
© Pelagic, 2019
San Leandro, CA USA 94577
TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE
Oceanic, the Oceanic logo type, Geo 4.0, and the Geo 4.0 logo are registered and unregistered trademarks, trade names, and service marks of Oceanic. The Graphic Diver Interface, Tissue Loading Bar Graph (TLBG), Pre-Dive Planning Sequence (PDPS), OceanLog, and Dual Algorithm are all registered and unregistered trademarks, trade names, and service marks of Pelagic. All rights are reserved.
PATENT NOTICE
U.S. patents have been issued to protect design features of our products. The list of patents issued and pending are available at dive-patent.com.
DECOMPRESSION MODEL
The programs within the Geo 4.0 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 4.0 dive computer model is based upon the latest research and experiments in decompression theory. Still, using the Geo 4.0, 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 prole.
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
4
Welcome
to
GEO 4.0 OPERATING MANUAL
OCEANIC
and
THANK YOU
for choosing the
Geo 4.0
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
5
GETTING STARTED
GEO 4.0 OPERATING MANUAL
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
6
GEO 4.0 OPERATING MANUAL
BASICS
Welcome to your new Geo 4.0. The Geo 4.0 is an easy to use dive computer utilizing a four button interface. Divers may choose between four modes of functionality consisting of Watch, Dive, Gauge, and Free Mode. Though the Geo 4.0 is easy to use, you will get the most out of your new Geo 4.0 if you take some time to familiarize yourself with its displays and operation. Information has been organized into easy to follow sections to aid you in learning all you need to know. There is also a glossary at the end of this guide for any terms that may sound unfamiliar. .
ACTIVATION
Geo 4.0 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 into service.
In this mode, Date and Time are updated as they normally would be. However, they are not displayed. Upon waking the Geo 4.0 up, the correct
Date and USA Pacic Time will be displayed and it will be ready to operate with full functions.
To wake the Geo 4.0 up from Deep Sleep mode, simultaneously depress the upper/right (SELECT) and lower/left (ADV) buttons for 3 seconds until the display comes on displaying the Watch Main Time screen, then release them.
NOTE: Once the Geo 4.0 is brought out of the Deep Sleep mode, it can only be placed back into it by the factory.
STANDBY (POWER SAVING) MODE
The Geo 4 shall enter Standby mode 10 minutes after Norm, Gauge, or Free Surface Modes have been activated (or 10 minutes after the post dive transition period has ended) and no button presses or dives have been initiated.
NOTE: Bluetooth function shuts down during Standby Mode to save battery life.
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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DISPLAY ICONS
GEO 4.0 OPERATING MANUAL
1
20
19
2
3
4
5
6
7
8
9
10
11
12
18
17
16
1 Tissue Loading Bar Graph 2 Conservative Factor 3 Daily Alarm Set 4 Nitrox 5 Time ID 6 Logbook 7 Surface 8 Depth ID (units) 9 Time ID
10 Variable Ascent Rate
13
14
15
11 Descend, Ascend, or Stop 12 Dive Time or # 13 Fraction of Oxygen 14 Low Battery 15 Gas # 16 Value is Max Depth 17 Bluetooth on 18 Deep Stop 19 Temperature
20 Partial Pressure of Oxygen
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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MODE
GEO 4.0 OPERATING MANUAL
SELECT
ADV.
LIGHT
BUTTONS
The Geo 4.0 utilizes 4 control buttons called the MODE, SELECT, ADV. (Advance) and, LIGHT buttons. They allow you
to select mode options and access specic information. They are also used to enter settings, activate the backlight, and acknowledge the audible alarm.
Pressing different combinations of these buttons will navigate through different menus and options of the Geo 4.0. The symbols in the table below will illustrate how to proceed through the menus.
SYMBOL MEANING
PRESS BUTTON LESS THAN 2 SECONDS
HOLD BUTTON GREATER THAN 2 SECONDS
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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BUTTON FUNCTIONS
ACTION FUNCTION
SELECT
MODE
GEO 4.0 OPERATING MANUAL
• to move backward through the Main Menu
• to decrease a setting
ADV.
MODE
MODE
ADV.
ADV.
MODE
SELECT
LIGHT
SELECT
LIGHT
• to select/save an option or setting
• to access Alt screens
SELECT
• to advance through selections
• to toggle or change setpoints
• to increase a setting
LIGHT
• to activate the backlight
ADV.
LIGHT
• to switch between Watch Mode and the active diving
MODE
SELECT
mode, while on the Main screen
• to exit a menu directly to the Main screen
ADV.
LIGHT
• to exit or step back to the previous screen or setting
MODE
ADV.
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
SELECT
LIGHT
10
ACTION BUTTON FUNCTION
• to scroll or increase a setting value at a faster rate
MODE
SELECT
ADV.
• to reset chronograph (Watch Mode)
GEO 4.0 OPERATING MANUAL
ADV.
LIGHT
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
11
WATCH MODE
GEO 4.0 OPERATING MANUAL
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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GEO 4.0 OPERATING MANUAL
WATCH MAIN SCREEN
The Watch Main screen is the default screen of the Geo 4.0. The Geo 4.0 allows you to choose between displaying one or two time zones. This is useful when wearing the Geo 4.0 as your primary timepiece while travelling.
NOTE: The terms HOME and AWAY are intended to represent two different time zones, your local and destination time zones
respectively. Either time can be set as the Default Time. If DUAL time is set ON, the time zone that is not set as the Default Time will display in the top section of the screen.
WATCH MAIN
(Dual Time ON)
WATCH MAIN
A.M.
Default Time
Daily Alarm set on
Day
WATCH MAIN
(Dual Time OFF)
P.M.
Time
DUAL Time is on
(This is the secondary time
zone, AWAY or HOME.)
Default Time is AWAY
(AWAY = alt time zone)
to Computer Mode
SELECT
ALT SHOW DUAL TIME
to Select an option
CDT CHRONOGRAPH DAILY ALARM SET TIME back to Main
MODE
Exit Menu
ALT
ALT displays the date, temperature, and elevation.
date
temperature
elevation EL2 - EL7, blank if sea level
SELECT
MODE
ADV.
LIGHT
backlight
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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GEO 4.0 OPERATING MANUAL
SHOW DUAL TIME
This setting allows you to choose whether or not to show dual time zones, both HOME and AWAY, on the Watch Main screen. If you select yes, the secondary time reading will display at the top on the Watch Main screen.
NOTE: If the Set Dual Time in the Set Time menu is set to OFF (00 hour difference), the secondary time will not be displayed on
the Watch Main screen.
SHOW DUAL TIME LEAD-IN
SELECT
MODE
access show dual
SHOW DUAL OFF/ON
SELECT
MODE
save setting
ADV.
LIGHT
toggle setting
ADV.
or OFF
- : - - if no secondary time set
LIGHT
CDT (COUNTDOWN TIMER)
This feature allows you to program a countdown timer with audible alarm. The initial options are OFF or SET. To set the timer you must save an hour value then the minute value. You may choose a value between 0:01 and 23:59. Once a countdown time is set, the ON selection becomes available in Set CDT screen . If On is selected, the CDT will run in the background until it counts down to 0:00, or it is set OFF. When a set Countdown time
reaches 0:00, the Audible Alarm will sound. During which time the graphic CDT will ash on the Watch Main screen.
NOTE: Switching to Norm, Gauge, Free modes, or initiating a dive will terminate the CDT and revert the CDT setting to OFF.
MODE
ADV.
decrease value
CDT LEAD-IN
MODE
SET CDT
SELECT
MODE
access CDT status
ADV.
LIGHT
toggle setting
SELECT
to save hour/min
CDT STATUS
WATCH MAIN
(during CDT Alarm)
SELECT
to selecttoggle setting
LIGHT
OFF, ON, or SET
ADV.
increase value
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
hour:min
ashing
LIGHT
14
GEO 4.0 OPERATING MANUAL
CHRONOGRAPH
The chronograph has a 9 lap memory. After 9, subsequent laps will be recorded and the earliest lap discarded. If the Chrono continues to run and reaches 9:59:59.99, it will stop and record that as a Lap. Subsequent presses of SELECT then have no effect.
CHRONOGRAPH LEAD-IN
MODE
ADV.
exit to
MODE
Watch Main
ADV.
reset timer
SELECT
access Chronograph status
LIGHT
CHRONOGRAPH STATUS
(≥ 5 seconds)
SELECT
lap # (1-9)
after 4.99 seconds, centiseconds display as - -
LIGHT
CHRONOGRAPH STATUS
(< 5 seconds)
SELECT
MODE
save lap 1 - 9
hr:min:sec
centiseconds
ADV.
LIGHT
stop timer, recall laps 1 - 9
NOTE: If the Chrono continues to run and reaches 9:59:59.99, it will stop and record that as a Lap. Subsequent presses of SELECT
then have no effect.
NOTE: Once the Chronograph has been set and started, it will remain on and displayed (or continue to run in the background)
while on the surface until reset by the user. Upon descending to 1.5 M/5 FT (i.e., entry into a Norm, Gauge, or Free Mode dive), operation will be terminated and the counter will reset to 0:00:00.00 (hr:min:sec.centisecond).
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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GEO 4.0 OPERATING MANUAL
DAILY ALARM
When set ON, the Daily Alarm, that runs in the background, will sound the audible alarm at the time set every day when that time equals the Watch Default Time selected. The Audible will not sound while operating in dive computer modes. Operation reverts back to Watch Main after selection of ON or OFF options.
DAILY ALARM LEAD-IN
MODE
ADV.
MODE
decrease value
ADV.
increase value
SELECT
LIGHT
SET DAILY ALARM
access Daily Alarm status
SELECT
hour:min
LIGHT
to save hour/min
toggle setting
DAILY ALARM STATUS
SELECT
MODE
to selecttoggle setting
ADV.
LIGHT
OFF, ON, or SET
SET TIME MENU
Selecting Set Time accesses a sub menu. Within this menu you can set the time settings: Date Format, Hour Format, Default Time, Alternate Time, Time of Day, and Date.
SELECT
MODE
access Set Time Menu
ADV.
LIGHT
1. DATE FORMAT
Choose your preferred date format.
SELECT
MODE
to select
ADV.
LIGHT
toggle setting
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
M - D = Month.Day D - M = Day.Month
16
2. HOUR FORMAT
Choose your preferred hour format.
MODE
ADV.
GEO 4.0 OPERATING MANUAL
SELECT
to select
LIGHT
toggle setting
12 or 24
3. DEFAULT TIME
This setting allows you to choose the time HOME or AWAY that displays as the default on the Watch Main.
SELECT
MODE
to select
ADV.
LIGHT
toggle setting
HOME or AWAY
4. ALTERNATE TIME
Alternate Time allows you to set another time zone that is referred to as AWAY Time. Selections available are (+/-), (0-23hr); (00, 15, 30, or 45 min) difference.
SELECT
MODE
decrease value
to select
ADV.
increase value
5. TIME OF DAY
Set the Default (Home or Away) time. Set hours then minutes.
MODE
decrease value
ADV.
increase value
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
LIGHT
SELECT
to save hour/min
hour:min
LIGHT
17
6. DATE
Set the year, month, and day in order. The corresponding digit will ash, allowing it to be set.
SELECT
MODE
decrease value
ADV.
increase value
to save year, month; day
LIGHT
GEO 4.0 OPERATING MANUAL
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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DIVE FEATURES
GEO 4.0 OPERATING MANUAL
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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GEO 4.0 OPERATING MANUAL
DTR (DIVE TIME REMAINING)
The Geo 4.0 constantly monitors No Decompression status and O2 Accumulation, and will display whichever time is the least amount available as
DTR on the No Decompression Dive Main screen. The Time being displayed will be identied by the NDC min (no decompression time) or O2 min
icons.
NO DECOMPRESSION
No Decompression is the maximum amount of time that you can stay at your present depth before entering decompression. It is calculated based on the amount of nitrogen absorbed by hypothetical tissue compartments. The rates each of these compartments absorb and release nitrogen is math­ematically modeled and compared against a maximum allowable nitrogen level.
Whichever compartment is closest to this maximum level is the controlling compartment for that depth. Its resulting value NDC (no decompression) will be displayed. It will also be displayed graphically as the TLBG Bar Graph, see Bar Graphs below.
As you ascend, the TLBG Bar Graph segments will recede as control shifts to slower compartments. This is a feature of the decompression model that is the basis for multilevel diving, one of the most important advantages that Oceanic dive computers offer.
DTR is No Decompression
O2 MIN (OXYGEN TIME REMAINING)
When set for nitrox operation, O2 SAT (Oxygen Saturation) during a dive is displayed on an ALT screen as a percentage of allowed saturation
identied by the O2 SAT icon. The limit for O2 SAT (100%) is set at 300 OTU (Oxygen Tolerance Units) per dive or 24 hour period. See the chart at the back of this manual for specic times and allowances. O2 SAT and O2 min values are inversely related; as the O2 SAT value increases the O2
min value decreases.
When the O2 min value becomes less than the No Decompression calculations for the dive, DTR (Dive Time Remaining) will be controlled by O2 SAT
and the O2 min value will be displayed as the DTR on the Dive Main screen, identied by the O2 min icon.
DIVE ALT 3 DIVE MAIN
% O2 Saturation
DTR is O2 MIN
BAR GRAPHS
The GEO 4.0 features two specic bar graphs.
1. The one on the left represents nitrogen loading. It is referred to as the TLBG (Tissue Loading Bar Graph).
2. The one on the right represents ascent rate. It is referred to as the VARI Bar Graph.
Nitrogen Loading
Ascent Rate
© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)
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