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

NOTICES 4

GETTING STARTED 6

BASICS 7
ACTIVATION 7
STANDBY (POWER SAVING) MODE 7
BUTTONS 9

WATCH MODE 12

WATCH MAIN SCREEN 13
ALT 13
SHOW DUAL TIME 14
CDT (COUNTDOWN TIMER) 14
CHRONOGRAPH 15
DAILY ALARM 16
SET TIME MENU 16

1. DATE FORMAT 16

2. HOUR FORMAT 17

3. DEFAULT TIME 17

4. ALTERNATE TIME 17

5. TIME OF DAY 17

6. DATE 18

DIVE FEATURES 19

DTR (DIVE TIME REMAINING) 20
NO DECOMPRESSION 20
O2 MIN (OXYGEN TIME REMAINING) 20
BAR GRAPHS 20
VARI BAR GRAPH 21
TLBG (TISSUE LOADING BAR GRAPH) 21
DUAL ALGORITHM® 21
CONSERVATIVE FACTOR 21
DEEP STOP 21
SAFETY STOP 22
LOW BATTERY WHILE ON THE SURFACE 22
LOW BATTERY DURING A DIVE 22
AUDIBLE/VISUAL ALARM 23

NORM SURFACE MODE 24

ON THE SURFACE BEFORE A DIVE 25
NORM STANDBY MODE 25
ALT 1 (LAST DIVE) 25
ALT 2 26
ALT 3 26
FLY/DESAT 26
PLAN 26
LOG 27
SET F (GAS MIX) 28
SET ALARMS 29

1. AUDIBLE ALARM 29

2. DEPTH ALARM 29

3. EDT (ELAPSED DIVE TIME) ALARM 29

4. TLBG (TISSUE LOADING BAR GRAPH) ALARM 30

5. DTR (DIVE TIME REMAINING) ALARM 30

SET UTILITIES 30

1. H2O ACTIVATION 31

2. UNITS (IMP/MET) 31

3. DEEP STOP 31

4. SAFETY STOP 32

5. ALGORITHM 32

6. CONSERVATIVE FACTOR 33

7. BLUETOOTH (BLUETOOTH COMMUNICATION) 33

8. GLO (BACKLIGHT) DURATION 33

9. SAMPLING RATE 34
SET MODE (OPERATION MODE) 34
HISTORY 34
SN (SERIAL NUMBER) 35

NORM DIVE MODE 36

INITIATING A DIVE 37
NO DECOMPRESSION DIVE MAIN 37
DIVE ALT 1 37
DIVE ALT 2 37
DEEP STOP PREVIEW 38
DEEP STOP MAIN 38
SAFETY STOP MAIN 38
SURFACING 39
DECOMPRESSION 40
DECOMPRESSION ENTRY 40
DECOMPRESSION STOP MAIN 40
CONDITIONAL VIOLATION (CV) 40
DELAYED VIOLATION 1 (DV 1) 41
DELAYED VIOLATION 2 (DV 2) 41
DELAYED VIOLATION 3 (DV 3) 41
VIOLATION GAUGE MODE DURING A DIVE 42
VIOLATION GAUGE MODE ON THE SURFACE 42
HIGH PO

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

ON THE SURFACE BEFORE A DIVE 46
GAUGE STANDBY MODE 46
INITIATING A DIVE 47
GAUGE DIVE MAIN 47
GAUGE DIVE ALT 1 47
GAUGE DIVE ALT 2 47
RUN TIMER 48
DELAYED VIOLATION 3 (DV3) 48

FREE MODE 49

FREE DIVE MODE DETAILS 50
ON THE SURFACE BEFORE A DIVE 51
FREE STANDBY MODE 51

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ALT 1 51
ALT 2 52
COUNTDOWN TIMER (CDT) 52
SET ALARMS 52
SET MODE (OPERATION MODE) 53
INITIATING A DIVE 53

1. ELAPSED DIVE TIME ALARM 53

2. DEPTH ALARMS 1-3 53
FREE DIVE MAIN 54
FREE DIVE ALT 1 54
FREE DIVE ALT 2 54
HIGH NITROGEN ALARMS 54

REFERENCE 55

UPLOADING/DOWNLOADING DATA 56
CARE AND CLEANING 56
INSPECTIONS AND SERVICE 56
BATTERY REPLACEMENT 56
ALTITUDE SENSING AND ADJUSTMENT 58

GEO 4.0 OPERATING MANUAL

TECHNICAL DATA 59

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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)

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GETTING STARTED

GEO 4.0 OPERATING MANUAL

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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.

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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

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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

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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.

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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

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WATCH MODE

GEO 4.0 OPERATING MANUAL

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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

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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

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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).

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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

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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

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DIVE FEATURES

GEO 4.0 OPERATING MANUAL

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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

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GEO 4.0 OPERATING MANUAL

VARI BAR GRAPH

The VARI Bar Graph provides a visual representation of ascent speed (i.e., an ascent speedometer). When the ascent is faster than the recommend-

ed 30 fpm (9 mpm), all segments ash and the message SLO (slow) ashes until the ascent is slowed.

# OF SEGMENTS ASCENT RATE,

FPM (MPM)

0 0 - 10 (0 - 3)

1 11 - 15 (3.1 - 4.5)

2 16 - 20 (4.6 - 6)

3 21 - 25 (6.1 - 7.5)

4 26 - 30 (7.6 - 9)

5 > 30 (> 9)

ASC ALARM TRIGGERED

ashing

TLBG (TISSUE LOADING BAR GRAPH)

The TLBG represents your relative No Decompression or Decompression status. The rst four segments represent No Decompression status and the
fth indicates a Decompression condition. As your Depth and Elapsed Dive Time increase segments are added. As you ascend segments recede, indi-

cating that additional No Decompression time is available. The Geo 4.0 monitors multiple different nitrogen compartments simultaneously and the
TLBG displays the one that is in control of your dive at any given time.

DUAL ALGORITHM®

The Geo 4.0 is congured with 2 algorithms which allows you to choose which set of NDLs (No Decompression Limits) will be used for nitrogen/oxy­gen calculations and displays relating to Plan Mode and DTR (Dive Time Remaining) for NORM dives.

You can select DSAT or Z+ prior to new dives. Also, the selection can be changed after dives once Desaturation Time decreases to 0:00, otherwise
the selection will lock in for 24 hours after the last dive.

DSAT was the original standard used by Oceanic in all of its dive computers until the dual function was implemented several years ago. It features
NDLs that are based on exposures and test data which also formed validation for the PADI RDP. It imposes restrictions for repetitive Decompression
dives which are considered more risky than general No Deco dives.

Z+ (the Pelagic Z+ algorithm) performance is based on Buhlmann ZHL-16c. It features NDLs that are considerably more conservative than the DSAT
version especially at shallower depths.

To create even greater margins of safety with respect to decompression, a Conservative Factor as well as Deep and Safety Stops are available and
can be activated for NORM No Decompression dives.

CONSERVATIVE FACTOR

When the CF (Conservative Factor) is set On, the dive time remaining, No Decompression/Oxygen Time Remaining, which are based on the algo­rithm and used for N2/O2 calculations and displays relating to Plan Mode, will be reduced to the values available at the altitude level that is 3,000 ft
(915 m) higher than the actual altitude at activation. Refer to the charts in the back of this manual for dive times.

DEEP STOP

When the DS (Deep Stop) selection is set ON, it will trigger after descending deeper than 80 ft (24 m). The Geo 4.0 then calculates (continually
updating) a Stop Depth equal to ½ the Max Depth.

NOTE: The Deep Stop feature only works in Norm mode while within No Decompression times.

• While 10 ft (3 m) deeper than the calculated Deep Stop, you will be able to access a Deep Stop Preview screen that will display the current calcu­lated Deep Stop Depth/Time.

• Upon initial ascent to within 10 ft (3 m) below the calculated Stop Depth, a Deep Stop screen displaying a Stop Depth at ½ the Max Depth will
appear with a countdown timer beginning at 2:00 (min:sec) and counting down to 0:00. If you descend 10 ft (3 m) below, or ascend 10 ft (3 m)
above, the calculated Stop Depth for 10 seconds during the countdown, the No Decompression Main will replace the Deep Stop Main display
and the Deep Stop feature will be disabled for the remainder of that dive. There is no penalty if the Deep Stop is ignored.

• In the event that you enter Decompression, exceed 190 ft (57 m), or a High O2 SAT (Oxygen Saturation) condition, ≥ 80%, occurs, the Deep

Stop will be disabled for the remainder of that dive.

• The Deep Stop is disabled during a High PO2 Alarm condition, ≥ set point.

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GEO 4.0 OPERATING MANUAL

SAFETY STOP

Upon ascent to within 5 ft (1.5 m) deeper than the SS depth set for 1 second on a No Decompression dive in which Depth exceeded 30 ft (9 m)
for 1 second, a beep will sound and a SS at the depth set will appear on the Dive Main display with a countdown beginning at the SS time set and
counting down to 0:00.

• If the SS was set for OFF, the display will not appear.

• In the event that you descend 10 ft (3 m) deeper than the Stop Depth for 10 seconds during the countdown, or the countdown reaches 0:00, the
No Decompression Main screen will replace the SS Main screen which will reappear upon ascent to within 5 ft (1.5 m) deeper than the Safety
Stop depth set for 1 second.

• In the event that you enter Decompression during the dive, complete the Decompression obligation, then descend below 30 ft (9 m); the SS Main
will appear again upon ascent to within 5 ft (1.5 m) deeper than the SS depth set for 1 second.

• If the diver ascends to within 3 ft (0.91 m) from the surface for 10 seconds, the SS is to be canceled.

• There is no penalty if you surface prior to completing the SS or choose to ignore it.

If set for Timer On
Upon ascending to 20 FT (6 M) for 1 second on a No Deco dive in which Depth exceeded 30 FT (9 M) for 1 second, 1 beep will sound and a Run
Timer will appear (if set On) displaying 0:00 (min:sec) until started.

• If the SS was set for Off or On, the Timer display will not appear.

• If you descend deeper than 30 FT (9 M) for 10 seconds, the No Deco Main will replace the Timer screen which will reappear upon ascent to 20
FT (6 M) for 1 second.

• If you ascend above 3 FT (0.91 M) for 10 seconds, or enter Deco, or a High O2 alarm condition occurs (100%), while the SS Timer is active, the

SS Timer will be disabled for the remainder of that dive.

LOW BATTERY WHILE ON THE SURFACE

WARNING: DO NOT dive with a low battery.

Warning Level

• The Geo 4.0 functions continue but the backlight is disabled.

• The Battery icon appears solid.

Alarm Level

• If in Dive Computer mode, the battery icon ashes for 5 seconds and operation reverts to Watch Time with the icon ashing until the Battery is

changed or voltage cannot sustain operation.

ashing

LOW BATTERY DURING A DIVE

Warning Level

• The Geo 4.0 functions continue but the backlight is disabled.

• The battery icon appears solid upon entry into Surface Mode.

ALarm Level

• The Geo 4.0 functions continue but the backlight is disabled.

• Upon entry into Surface Mode, the Battery icon (shell only with no inner bar) ashes then operation reverts to Watch Time.

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GEO 4.0 OPERATING MANUAL

AUDIBLE/VISUAL ALARM

While operating in Dive or Gauge Mode, the audible alarm will emit 1 beep per second for 10 seconds when alarms strike, unless it is set to Off.
During that time, the audible alarm can be acknowledged and silenced by pressing the SELECT button.

An LED warning light, on the side of the housing, is synchronized with the audible alarm and ashes as the audible alarm sounds. It will turn off

when the alarm is silenced. The audible and LED alarms will not be active if the audible alarm is set to OFF (a Set Alarms setting).

Free Dive Modes have their own alarms which emit multiple beeps multiple times which cannot be acknowledged or set to OFF.

Events that emit (10) beeps >> each sound for ½ sec with ½ sec silence between beeps:

• Watch Daily Alarm.

• Watch CDT Alarm.

• DIVE, GAUGE - Ascent Rate too fast.

• DIVE, GAUGE - Depth Alarm.

• DIVE, GAUGE - Elapsed Dive Time Alarm.

• DIVE - Dive Time Remaining Alarm.

• DIVE - Tissue Loading Bar Graph Alarm.

• DIVE - entry into Decompression.

• DIVE - Conditional Violation.

• DIVE - Delayed Violations 1, 2.

• DIVE, GAUGE - Delayed Violation 3.

• DIVE, GAUGE - entry into Violation Gauge Mode.

• DIVE - PO2 Warning and Alarm.

• DIVE - O2 Warning and Alarm.

• DIVE - Gas Switch Alarm.

Events that emit (3) short beeps:

• FREE - CDT Alarm.

• FREE - Tissue Loading Bar Graph Alarm.

• FREE - Violation, entry into Decompression.

• FREE - DA1 to DA3 Alarms.

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23

NORM SURFACE MODE

GEO 4.0 OPERATING MANUAL

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24

GEO 4.0 OPERATING MANUAL

ON THE SURFACE BEFORE A DIVE

The Dive Main screen will display the SURF (Surface Time) and the selected FO2 of the breathing gas. The surface time displayed is the time since
activation or the surface interval after a dive.

nitrox

conservative
factor

time of day

bluetooth on

DIVE MAIN

(before a dive)

(more than 10 minutes after a dive)

hr:min

residual
nitrogen

dive #

DIVE MAIN

Gas #

SELECT

ALT 1

to
Watch
Mode

DIVE MAIN

SELECT

MODE

ALT 2

to Select
an option

ALT 3 (nitrox only)
FLY/DESAT
PLAN
LOG

Exit Menu

MODE

SET FO2 (gas mix)
SET ALARMS
SET UTILITIES
SET MODE

ADV.

LIGHT

backlight

HISTORY
SERIAL NUMBER
back to Main

NORM STANDBY MODE

The Geo 4 shall enter Standby mode 10 minutes after Norm Surface Mode has been activated (or 10 minutes after the post dive transition period
has ended) and no button presses or dives have been initiated. Pressing a button will wake the Geo 4.0 up from Standby Mode.

NOTE: Bluetooth function shuts down during Standby Mode to save battery life.

NORM STANDBY MODE

(no previous dive)

NORM STANDBY MODE

(post dive)

ALT 1 (LAST DIVE)

The ALT 1 screen displays essential data from the last dive. If there has been no dive within the current activation cycle, dashes will display for the
max depth and elapsed dive time.

2 PREVIOUS DIVES

max depth

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hr:min

9:- - displays
if time > 9:59

NO PREVIOUS DIVES

elapsed
dive time

dive #

25

ALT 2

The ALT 2 screen displays temperature and current elevation readings.

GEO 4.0 OPERATING MANUAL

temperature

elevation

(EL2 - EL7, blank if sea level)

ALT 3

The ALT 3 screen displays only after a nitrox dive. It displays the current oxygen saturation level, PO2 Alarm setting, and the current gas mix.

O

Saturation

2

PO

Alarm

2

setting

32% O

2

Gas #

FLY/DESAT

The FLY/DESAT screen displays the Time to Fly and the DESAT (desaturation) countdown. The Time to Fly countdown shall begin counting from
23:50 to 0:00 (hr:min), 10 minutes after surfacing from a dive. The DESAT counter shall provide calculated time for Tissue Desaturation at sea level
taking into consideration the CF (Conservative Factor) if it was set on. It shall begin counting down 10 minutes after surfacing from NORM or FREE
dives counting down from a maximum of 23 to 10 (hr only), then 9:59 to 0:00 (hr:min). When the DESAT countdown reaches 0:00 (hr:min), which
will generally occur prior to the FLY countdown reaching 0:00 (hr:min), it will remain on the display as 0:00 until the Fly count down reaches 0:00.

NO PREVIOUS DIVES 10 MIN AFTER A DIVE

hr:min

9:- - displays
if time > 9:59

PLAN

This mode calculates dive depth and time limits. To do so, it accounts for any residual nitrogen, oxygen, surface intervals, the programmed gas mix,
and PO2 alarm setting. Either NDC (No Decompression) or O2 MIN limits are displayed, depending on whether nitrogen or oxygen levels will be
the limiting factor. The time limit will display in minutes.

NOTE: Depths exceeding the MOD (Maximum Operating Depth), if nitrox, or that have less than 1 minute allowed dive time will

not be displayed.

PLAN LEAD-IN

SELECT

exit to
Main Menu

planned depth

LIGHT

No Decompression
or O2 MIN

blank if
Conservative
turned OFF

current PO
setpoint, blank if
FO2 is Air

MODE

ADV.

Alarm

2

SELECT

LIGHT

% O2,

current
FO2 setpoint

to Planner

to decrease
depth

to increase
depth

MODE

ADV.

Maximum
Operating
Depth

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26

GEO 4.0 OPERATING MANUAL

LOG

The log stores Information from the latest 24 Dive and/or Gauge mode dives for viewing.

• If no dives are recorded, the message NONE YET will be displayed.

• After exceeding 24 dives, the most recent dive is stored while the oldest is deleted.

• Dives are numbered from 1 to 24 starting each time a dive is activated in either Norm (or Gauge) mode. After the post dive 24 hour period has

elapsed and the unit shuts off, the rst dive of the next activation period will be recorded as dive #1.

• I n the event that dive time (DIVE MIN) exceeds 999 min, the data at the 999 interval is recorded in the Log upon surfacing of the unit.

• The message GAU (Gauge) or VIO (violation) will display, in the lower left, if applicable on the Log Data 1.

NOTE: New data will automatically overwrite the oldest data in memory when the memory becomes full. If you do not remem-

ber to log or download your dives, they will be lost when the memory overwrites. See the Download section of this manual for
instructions on downloading dives.

LOG LEAD-IN LOG PREVIEW

SELECT

to Log Data 1

date of dive

dive
start time

LIGHT

MODE

ADV.

SELECT

LIGHT

to Log Preview

MODE

step backward
through log
records

ADV.

max tissue loading,
blank if GAUGE
dive

MODE

ADV.

highest PO
reached during
the dive

MODE

ADV.

max depth

LOG DATA 3

2

LOG DATA 1

elapsed dive time (min)

SELECT

gas mix
FO

(% O2)

2

LIGHT

Surface Time
hr:min

SELECT

to Log Data 2

max
ascent rate

LIGHT

back to
Log Preview

% O

Saturation

2

at end of dive, - - if the
dive entered
Violation Gauge
Mode

step forward
through log
records

MODE

ADV.

LOG DATA 2

lowest
temperature

dive #

SELECT

to Log Data 3
or back to
Log Preview

LIGHT

recorded elevation of
dive location,
SEA (or EL 2 - EL7)

NOTE: Log Data 3 only displays for nitrox dives; it is bypassed if the dive was an air dive.

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27

GEO 4.0 OPERATING MANUAL

SET F (GAS MIX)

Within this submenu you can change the two available gas mixes from air to any nitrox mix between 21 - 100 FO2 (% O2), PO2 Alarm settings, and

whether to use 1 or 2 gases. Nitrox mixes are displayed with their corresponding MOD (Maximum Operating Depth) and the current PO2 Alarm
setting for the selected gas. Default settings are FO2 Air with no PO2 alarm value for Gas 1, and OFF for Gas 2. Settings revert to the defaults when
24 hours elapse without conducting a dive. If you set a nitrox mix value for any gas the PO2 alarm value will default to 1.60 until changed.

NOTE: Once either gas is set for nitrox, the other gas that is set for AIR will automatically be set to 21%. The AIR option will not

be displayed as an FO2 setting until 24 hours elapse after the last dive.

NOTE: When FO2 is set for AIR, oxygen related data (such as PO2, % O2) will not be displayed at any time during the dive, on

the surface, or in Plan Mode. Though these oxygen values will be tracked internally for use in any subsequent nitrox dives.

NOTE: Gas 1 cannot be set to OFF.

NOTE: The PO2 alarm value is set in the Set Alarms Menu.

MODE

ADV.

decrease
FO

2

value

SET FO

MODE

ADV.

LEAD-IN

2

SET GAS 1 PO

SELECT

LIGHT

2

to Set Gas 1

SELECT

save setting,
to Set Gas 2
FO

2

MOD, blank if AIR

LIGHT

decrease
FO

2

value

increase
FO

2

value

decrease
FO

2

value

SET GAS 1 FO

MODE

ADV.

PO2 Alarm value,
blank if AIR

SET GAS 2 FO

MODE

ADV.

2

2

SELECT

save setting,
to Set Gas 1
PO

MOD, blank if AIR

LIGHT

FO2 (O2%),

(ashing)

SELECT

save setting,
to Set Gas 2
PO

MOD, blank if AIR

LIGHT

alarm

2

alarm

2

increase
PO

2

value

PO2 Alarm value

(ashing), blank if AIR

SET GAS 2 PO

MODE

2

decrease
FO

2

value

ADV.

increase
PO

2

value

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

PO2 Alarm value

(ashing), blank if

AIR

FO2 (O2%)

SELECT

to Set FO
Lead-in

MOD, blank if AIR

LIGHT

FO2 (O2%)

increase
FO

2

value

2

PO2 Alarm value,
blank if AIR

FO2 (O2%)

(ashing)

28

GEO 4.0 OPERATING MANUAL

SET ALARMS

Within this submenu you can customize the following seven alarm settings. Within this menu you can customize the following ve alarm settings.

SET ALARMS LEAD-IN

SELECT

MODE

to Set Audible
Alarm

ADV.

LIGHT

1. AUDIBLE ALARM

The Audible Alarm feature allows you to set audible alarms ON or OFF.

SET AUDIBLE ALARM

SELECT

MODE

to select

ADV.

LIGHT

toggle setting

OFF or ON

2. DEPTH ALARM

The Depth Alarm feature allows you to set a maximum depth alarm.

SET DEPTH ALARM

SELECT

MODE

decrease
value

increase

ADV.

OFF, 30 - 330 ft (10 - 100 m)

to select

LIGHT

value

3. EDT (ELAPSED DIVE TIME) ALARM

This feature allows you to set an alarm to go off at a predetermined amount of dive time.

SET EDT ALARM

SELECT

decrease
value

MODE

to select

DEPTH ALARM TRIGGERED

ashing

EDT ALARM TRIGGERED

ADV.

increase
value

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

ashing

LIGHT

OFF, 10 - 180 min

29

GEO 4.0 OPERATING MANUAL

4. TLBG (TISSUE LOADING BAR GRAPH) ALARM

This feature allows you to set an alarm to go off at a predetermined number of TLBG segments.

SET TLBG ALARM

decrease
segments

SELECT

MODE

to select

TLBG ALARM TRIGGERED

ashing

# of segments
selected if ON

ADV.

LIGHT

or OFF, ashing

increase
segments

5. DTR (DIVE TIME REMAINING) ALARM

This feature allows you to set an alarm to go off with a designated reserve of dive time remaining.

SET DTR ALARM

SELECT

decrease
value

MODE

to select

DTR ALARM TRIGGERED

ashing

ADV.

LIGHT

increase

OFF, 5 - 20 min

value

SET UTILITIES

Within the Set Utilities menu you can customize the following nine operational functions.

SET UTILITIES LEAD-IN

SELECT

MODE

to Set H2O
Activation

ADV.

LIGHT

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30

GEO 4.0 OPERATING MANUAL

1. H2O ACTIVATION

The H2O Activation feature allows you to turn OFF water contact activation.

WARNING: With H2O Activation turned OFF, you must remember to manually activate the Dive Mode

before any dive.

SET H2O ACTIVATION

SELECT

MODE

to select

ADV.

LIGHT

toggle setting

OFF or ON

2. UNITS (IMP/MET)

The Units feature allows you to select whether IMP (imperial) or MET (metric) units of measure will be displayed.

SET UNITS

SELECT

MODE

to select

ADV.

LIGHT

toggle setting

MET or IMP

3. DEEP STOP

The Deep Stop feature can be set ON or OFF.

SET DEEP STOP

SELECT

MODE

to select

ADV.

toggle setting

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

LIGHT

OFF or ON

31

GEO 4.0 OPERATING MANUAL

4. SAFETY STOP

The Safety Stop feature can be set ON, OFF, or TMR (timer). If ON is selected, you may choose from an available 3 or 5
min Safety Stop at depths of 10, 15, or 20 ft (3, 4, 5, or 6 m). If TMR (timer) is selected, a manual timer will be available
instead of the automatic Safety Stop count down.

toggle setting

decrease
value

increase
value

SET SAFETY STOP

MODE

ADV.

SET SAFETY STOP DEPTH

MODE

ADV.

10, 15, or 20 ft
(3, 4, 5, or 6 m)

SELECT

to select

LIGHT

OFF, ON, or TMR

SELECT

to select

LIGHT

decrease
value

increase
value

SET SAFETY STOP TIME

SELECT

MODE

to select

ADV.

LIGHT

3:00 or 5:00
(min:sec)

5. ALGORITHM

This feature allows the choice of using the Z+ or DSAT algorithms, for nitrogen and oxygen calculations. See page 12 for
further Dual Algorithm details.

NOTE: Changing the algorithm is blocked during 24 hours after NORM dives unless Desat time decreases

to 0:00.

SET ALGORITHM

SELECT

MODE

to select

ADV.

LIGHT

toggle setting

or Z+

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32

6. CONSERVATIVE FACTOR

The Conservative factor tables feature can be set ON or OFF.

SET CONSERVATIVE FACTOR

SELECT

MODE

to select

ADV.

LIGHT

GEO 4.0 OPERATING MANUAL

toggle setting

OFF or ON

7. BLUETOOTH (BLUETOOTH COMMUNICATION)

Within this screen the Bluetooth may be turned ON or OFF. When ON is selected, dashes will display sequentially at the
top of the screen indicating that Bluetooth is initiating. When Bluetooth is turned on it will operate in snifng mode (search­ing for compatible devices) while on the surface and the Geo 4.0 is not in Standby Mode. Communication with your Geo

4.0 must be initiated with your mobile device using Diverlog+ software.

NOTE: When Bluetooth is ON the Bluetooth icon will be displayed when on the surface and in Norm,

Gauge, or Free Mode but not during Watch or Standby Mode. Bluetooth is temporarily deactivated when
the Geo 4.0 enters Watch Mode, Standby Mode, or a dive is started. The Geo 4.0 returns to "sniffing"
mode when the Geo 4.0 returns to Surface Mode after a dive or a button is pushed to wake the computer
from Standby Mode on the surface. You will notice the Bluetooth icon flashing as the Bluetooth function is
reinitiating.

SET BLUETOOTH

SELECT

MODE

to select

ADV.

LIGHT

toggle setting

OFF or ON

8. GLO (BACKLIGHT) DURATION

This setting is the duration the backlight stays on after releasing the buttons.

SET GLO DURATION

decrease
value

increase
value

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

MODE

ADV.

GLO = backlight

SELECT

to select

LIGHT

0, 5, or 10 sec

33

GEO 4.0 OPERATING MANUAL

9. SAMPLING RATE

The Sample Rate controls how frequently the Geo 4.0 stores a data snapshot for Diverlog + Download during a dive. Set­ting options are 2, 15, 30, or 60 second intervals. Shorter intervals will provide a more precise record of your dives.

NOTE: New data will automatically overwrite the oldest data in memory when the memory becomes full.

The Geo 4.0 Log and Diverlog + Download data are stored separately in different partitions of the memo­ry. The Log only stores a short summary of each dive. Alternately, the Diverlog + Download function stores
much larger files for each dive. Depending on the chosen settings and dive durations, it is possible to see
dives stored in the Geo 4.0's onboard Log that have already been overwritten in the Diverlog + Down­load Partition. Choosing a longer Sample Rate interval will consume less memory per dive. Remember to
download your dives more frequently if you are using a shorter Sample Rate interval.

decrease
value

SET SAMPLE RATE

MODE

SELECT

DOWNLOAD MEMORY CAPAC-

to select

DIVE & GAUGE

SAMPLE

RATE

ITY

MAXIMUM

HOURS

(seconds)

2 4

15 32

30 64

60 128

increase

ADV.

LIGHT

2, 15, 30, or 60 sec

value

SET MODE (OPERATION MODE)

Set Mode allows you to choose between Norm (standard recreational dive), Gauge, and Free (free diving) modes of operation.

NOTE: Once a dive is conducted in Gauge mode, the Geo 4.0 shall operate with limited functions without any decompression or

oxygen monitoring functions. A 24 hour surface interval shall be required for the unit to operate as a full function dive com­puter in Norm or Free mode.

SET MODE LEAD-IN

MODE

SELECT

MODE

to Set Mode

SET MODE

SELECT

to select

NOR, GAU, or FRE

ADV.

LIGHT

ADV.

LIGHT

toggle setting

HISTORY

History is a summary of all basic data recorded during Norm and Gauge mode dives.

NOTE: Dives made in Free mode are not shown in History or the Log Mode. Free dive data is only visible using the Download

software.

HISTORY LEAD-IN

MODE

ADV.

(History Data 1)

SELECT

to History
Data 2

total dive hours,
0 - 19999

LIGHT

total # of dives, 0 - 999

lowest recorded

water temperature

deepest recorded dive longest dive time

HISTORY DATA 2

SELECT

MODE

to History
Lead-in

ADV.

LIGHT

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34

GEO 4.0 OPERATING MANUAL

SN (SERIAL NUMBER)

Information displayed on the Serial Number screen should be recorded and kept with your sales receipt; it will be required in the event that your

Geo 4.0 requires factory service. The Geo 4.0 is congured with hidden feature that clears nitrogen and oxygen calculations. This is intended for

facilities using the Geo 4.0 for rental or training activities, not for general use by individual divers. The feature is hidden to prevent accidental use. If
you enter the Clear Data screen by accident, you may exit without change by holding the SEL button for 2 seconds.

WARNING: Reset after a dive and subsequent use for a repetitive dive conducted by the same diver could result in serious injury

or death.

CLEAR DATA

SELECT

Save the rst 2

digits, then the
second 2 digits

MODE

SERIAL NUMBER

SELECT

access
Clear Data

revision #

MODE

decrease
value

ADV.

LIGHT

serial #

increase

ADV.

LIGHT

code

value

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

35

NORM DIVE MODE

GEO 4.0 OPERATING MANUAL

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

36

GEO 4.0 OPERATING MANUAL

INITIATING A DIVE

With the Geo 4.0 in Dive mode, a dive will commence upon descending to 5 ft (1.5 m) for at least 5 seconds. Below is a diagram to help you navi­gate Dive mode functions.

NO DECOMPRESSION NORM DIVE MAIN

SELECT

MODE

ADV.

ADV.

ALT 1
ALT 2

LIGHT

Backlight

(nitrox only)
back to Main

to Deep Stop
Preview

NO DECOMPRESSION DIVE MAIN

From the Main screen you can see all critical dive parameters. During a dive an audible alarm may sound and the priority of information displayed
may change. This is to indicate a safety recommendation, warning, or alarm. The following information in this chapter demonstrates and describes
an uneventful dive, in terms of safety. Alarms are described in the Complications section of this chapter.

NOTE: Before diving with the Geo 4.0 take time to familiarize yourself with both normal and alarm conditions of operation.

DIVE MAIN

depth

Dive Time Remaining
0 - 599 min, all times greater than 599 display as 599
(NDC min or O2 min depending on which is the limiting factor)

Tissue Loading

Bar Graph

max depth

ascent rate
bar graph

elapsed dive time
0 - 999 min

Gas #

deep stop if triggered

DIVE ALT 1

This screen simply tells you the current time of day and ambient temperature.

DIVE ALT 2

The ALT 2 screen displays information pertaining to nitrox; it is bypassed if the Geo 4.0 is set for air.

% O2 saturation

0 - 100

current

value

PO

2

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

FO

setting

2

37

GEO 4.0 OPERATING MANUAL

DEEP STOP PREVIEW

If Deep Stop was set to ON in the Utilities Menu, the Deep Stop preview screen is available after exceeding 80 ft (24 m) of depth. The Deep Stop is
always at a depth half that of your maximum depth during the dive. This preview screen keeps track of that depth for you.

Deep Stop
depth

stop time (min:sec)

DEEP STOP MAIN

If triggered, the Deep Stop will activate upon ascending to within 10 ft (3 m) below the calculated Deep Stop depth. The stop time will be displayed
and count down to 0:00 as long as you stay within 10 ft (3 m) above or below the stop. While Deep Stop Main is displayed, you may access up
to 3 ALT displays by pressing the ADV button to cycle through them. They are similar to the No Decompression Main, Dive ALT 1, and Dive ALT 2

displays, respectively. See Deep Stop in the Dive Features chapter for further details.

NOTE: The Geo 4.0 does not penalize for a missed Deep Stop.

stop depth

remaining
stop time
(min:sec)

SAFETY STOP MAIN

If triggered, the Safety Stop will activate upon ascent to within 5 ft (1.5 m) deeper than the Safety Stop depth on a No Deco dive. The stop time will
then countdown to 0:00. While Safety Stop Main is displayed, you may access up to 3 ALT displays by pressing the ADV button repeatedly. They
are similar to the No Deco Main, Dive ALT 1, and Dive ALT 2 displays, respectively. See Safety Stop in the Dive Features chapter for further details.

NOTE: The Geo 4.0 does not penalize for a missed Safety Stop.

stop depth

remaining
stop time
(min:sec)

When the Safety Stop is set for Timer, the graphic TMR with Run Time counting up from 0:00 to 9:59 (min:sec) then 10 to 999 (min) will be dis­played instead of a set Stop Depth/Time.

reset timer
if stopped

SELECT

MODE

start/stop
timer

ADV.

LIGHT

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38

GEO 4.0 OPERATING MANUAL

SURFACING

Upon ascending to 3 ft (0.9 m) the Geo 4.0 transitions to Dive Surface mode.

NOTE: The Geo 4.0 requires a 10 minute surface interval to record a subsequent dive as a separate dive in the Log. Otherwise,

the dives will be combined and recorded as a single dive in the Geo 4.0 memory.

surface time

residual
nitrogen

(hr:min)

max depth
reached

elapsed dive
time

GAS SWITCHES

WARNING: Historically, many accidents and near misses have occurred by switching to the wrong gas at the wrong depth. DO

NOT attempt gas switch decompression dives without proper education and training to do so from an internationally recognized
training agency.

Overview

• All dives begin with GAS 1.

• The GAS defaults to # 1 after 10 minutes on the surface.

• Gas switches can only be made when a Dive Main screen is displayed.

• Gases cannot be switched while on the surface.

• The Gas Switch Menu cannot be accessed during the sounding of alarms.

• If an alarm strikes while in the Gas Switch Menu, the switch operation is terminated (reverting to the Dive Main screen.

to switch gas

DIVE MAIN

SELECT

MODE

next gas
or back to
Main

ADV.

LIGHT

CONFIRM GAS SWITCH

SELECT

MODE

conrm

gas switch

ADV.

LIGHT

If the current PO2 value is greater than 1.6, then a warning not to switch will display. The Geo 4.0 will maintain the current gas without switching.
The diver may override the Geo 4.0 and force the gas switch by pressing the SELECT button during the "dont CHNG TO" message.

WARNING: Switching to gases with a PO2 above 1.6 has a high risk of oxygen poisoning, convulsions, and drowning. Doing

so should always be avoided. It is intended as a last resort option because of the likelihood of injury or drowning. Always dive
within your training, experience, and skill level.

setting

FO

2

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

39

GEO 4.0 OPERATING MANUAL

COMPLICATIONS

The preceding information has described standard dive operations. Your new Geo 4.0 is also designed to help you to the surface in less than ideal
situations. The following is a description of these situations. Take some time to familiarize yourself with these operations before diving your Geo 4.0.

DECOMPRESSION

Decompression (deco) mode activates when theoretical No Decompression time and depth limits are exceeded. Upon entry into decompression, the

audible alarm will sound and the alarm LED will ash. The full Tissue Loading Bar Graph and Up Arrow icon will ash until the audible is silenced.

• Once within 10 ft (3m) below the required Stop Depth (stop zone), the Full Stop icon (both Arrows with Stop Bar) will be displayed solid.

To fulll your decompression obligation, you should make a safe controlled ascent to a depth slightly deeper than, or equal to, the required stop

depth indicated and decompress for the stop time indicated. The amount of decompression credit time that you receive is dependent on Depth, with
slightly less credit given the deeper you are below the Stop Depth indicated. You should stay slightly deeper than the required Stop Depth indicated
until the next shallower Stop Depth appears. Then you can slowly ascend to that indicated Stop Depth but not shallower.

DECOMPRESSION ENTRY

Upon entry into decompression (deco) the audible alarm will sound and the alarm LED will ash until the audible is silenced. The up arrow and
full Tissue Loading Bar Graph icons will ash. Additionally, the stop depth, stop time, and the TAT (Total Ascent Time) values will be displayed. TAT

includes stop times at all required Decompression Stops plus vertical ascent time based on the max ascent rate allowed.

Total Ascent Time
0 - 999, then - - if
greater than 999 min

stop depth remaining stop

up arrow

time (min)

DECOMPRESSION STOP MAIN

Decompression (deco) Stop Main will display upon ascending to within 10 ft (3 m) below the Decompression Stop depth. The full stop graphic (op­posed arrows with stop bar) will be displayed solid. While Decompression Stop Main is displayed, you may access up to 3 ALT displays by pressing
the ADV button to cycle through them. They are similar to the No Decompression Main, Dive ALT 1, and Dive ALT 2 displays, respectively.

Total Ascent Time 0 - 999,
then - - if greater than 999
min

stop depth

full stop graphic

remaining stop
time (min)

CONDITIONAL VIOLATION (CV)

Upon ascent above the required Decompression (deco) Stop depth, operation will enter Conditional Violation during which time no off gassing

credit will be given. The Audible alarm will sound and the alarm LED will ash. The full Tissue Loading Bar Graph and down arrow will ash until the

audible alarm is silenced, then the Tissue Loading Bar Graph will be solid.

• The down arrow continues to ash until descending below the required Stop Depth (within stop zone), then the full stop graphic (opposed arrows

with stop bar) will be on solid.

• If you descend deeper than the required Decompression Stop before 5 minutes elapse, Decompression operation will continue with no off gassing
credit given for time above the Stop. Instead, for each minute above the Stop 1½ minutes of penalty time will be added to the required Stop Time.

• The added penalty (decompression) time will have to be worked off before obtaining off gassing credit.

• Once the penalty time is worked off, and off gassing credit begins, required Decompression Stop Depths and Time will decrease toward zero. The
Tissue Loading Bar Graph will recede into the No Decompression zone, and operation will revert to No Decompression mode.

Tissue Loading
Bar Graph

ashing

missed
stop
depth

down arrow ashing

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stop time (min)

40

GEO 4.0 OPERATING MANUAL

DELAYED VIOLATION 1 (DV 1)

If you remain shallower than a Decompression Stop Depth for more than 5 minutes, operation will enter DV1* which is a continuation of CV with

penalty time still being added. Again, the audible alarm will sound and the full Tissue Loading Bar Graph will ash until it is silenced. ALT screens are

accessed and appear similar to Decompression ALT screens.

*The difference is that 5 minutes after surfacing from the dive, operation will now enter Violation Gauge Mode.

• The down arrow continues to ash until descending below the required Stop Depth, then the full stop graphic will be on solid.

• If the DV1 status is ignored, the Geo 4.0 will enter DV1 Surface mode for 5 minutes upon surfacing from the dive. The down arrow, Decompres­sion Stop depth/time, and Surface Time will be displayed. After 5 minutes on the surface in DV1 mode, the unit will enter VGM (Violation Gauge
Mode).

DV1 < 5 MIN ON SURFACE

Surface Time
(hour:min)

Tissue Loading
Bar Graph

ashing

missed
stop
depth

DV1 DIVE MAIN

time required at
missed stop (min)

down arrow ashing

DELAYED VIOLATION 2 (DV 2)

If the calculated Decompression obligation requires a Stop Depth between 60 ft (18 m) and 70 ft (21 m), operation will enter DV2.

The audible alarm will sound and the alarm LED will ash. The full Tissue Loading Bar Graph will ash until the audible is silenced.

• The up arrow ashes if 10ft (3 m) deeper than the required Stop Depth.

• Once within 10 ft (3 m) of and below the required Stop Depth, the full stop graphic (opposing arrows with stop bar) will be displayed solid.

Decompression
Stop depth
60 -70 ft
(18 - 21 m)

DELAYED VIOLATION 3 (DV 3)

If you descend deeper than the maximum functional depth*, the audible alarm will sound, the alarm LED will ash, and the up arrow will ash. Addi­tionally, Current Depth will only indicate dashes signifying that you are too deep.

* The maximum functional depth (330 ft / 100 m) is the depth at which the Geo 4.0 can properly perform calculations or provide accurate display

information.

Upon ascending above the maximum functional depth, current depth will be restored. However, the log for that dive will display dashes for max
depth.

ashing

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41

GEO 4.0 OPERATING MANUAL

VIOLATION GAUGE MODE (VGM) DURING A DIVE

During Dive mode dives, operation will enter VGM when Decompression requires a Stop Depth greater than 70 ft (21 m). It will also enter VGM if
Deco is activated during a dive in Free mode, described later. Operation would then continue in VGM during the remainder of that dive and for 24
hours after surfacing. VGM turns the Geo 4.0 into a digital instrument without any decompression or oxygen related calculations or displays. Upon

activation of VGM, the audible alarm will sound and the alarm LED will ash. The message VIO (violation) with the up arrow will ash. After the

audible alarm becomes silent (10 seconds), the NDC (No Decompression) and Tissue Loading Bar Graph will not display for the rest of the dive.

VGM DURING AUDIBLE VGM AFTER AUDIBLE

Tissue Loading
Bar Graph

ashing

removed

VIOLATION GAUGE MODE (VGM) ON THE SURFACE

The message VIO (violation) is displayed until 24 hours elapse with no dives. During that 24 hours, VGM lockout does not allow access to the Set
Gas, Plan, Desat, and Free mode features/screens. All Watch functions will be allowed.

• The Fly countdown timer provides the time remaining before normal operation can resume with full features and functions.

• In the event that a dive is made during the 24 hour lockout period, a full 24 hour surface interval must then be served before all functions are
restored.

ashing

HIGH PO

Alarm >> at Set Point value, except in Deco then at 1.60 only

2

Alarm

If PO2 continues to increase and reaches the alarm set point, the audible alarm sounds again. The PO2 value will ash in
place of max depth during the audible alarm. After the audible alarm is silenced, the PO

Additionally, the up arrow will ash continually until PO

DURING AUDIBLE ALARM

ashing

PO2 During Decompression

The PO2 alarm setting does not apply when in Decompression. If PO2 reaches 1.60 while at a Decompression Stop, the PO2
value (1.60) with icon will alternate with decompression stop depth/time until the PO2 value decreases below 1.60.

PO2 alternating
with max depth

will alternate with max depth.

decreases below the alarm set point.

2

2

AFTER AUDIBLE ALARM

ashing

PO2 alternating
with decompression
stop/depth

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42

HIGH O2 SAT (OXYGEN SATURATION)

Warning >> at 80 to 99% (240 OTU)
Alarm >> at 100% (300 OTU)

Warning

When O2 reaches the Warning Level, the audible alarm sounds and the O2 SAT (saturation) value will ash in place of the
DTR (Dive Time Remaining). The DTR will be restored when the audible alarm is silenced.

DURING AUDIBLE ALARM AFTER AUDIBLE ALARM

GEO 4.0 OPERATING MANUAL

ashing

DTR restored,
showing O2 min

Alarm

If O2 SAT reaches the Alarm level, the audible alarm sounds. At the same time, the up arrow and the O2 SAT value will

ash in place of DTR until surfacing.

ashing

ashing

Warning During Decompression

When O2 SAT reaches the Warning Level, the audible alarm sounds and the O2 SAT value will ash in place of Total

Ascent Time. The Total Ascent Time will be restored when the audible alarm is silenced.

DURING AUDIBLE ALARM

ashing

Alarm During Decompression

When O2 SAT reaches the Alarm Level, the audible alarm sounds and the O2 SAT value will ash in place of Total Ascent

Time until surfacing.

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ashing

43

GEO 4.0 OPERATING MANUAL

Alarm On Surface

• If O2 SAT is 100% upon surfacing while in No Decompression, O2 SAT 100% will ash until the O2 SAT value decreases
below 100%.

• If you surface due to 100% O2 without having completed the Decompression obligation, the full TLBG and O2 value
(100) will ash with O2SAT icons for the rst 10 minutes, then operation will enter Violation Gauge Mode.

SURFACE,

100% O2 SAT

ashing

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GAUGE MODE

GEO 4.0 OPERATING MANUAL

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45

GEO 4.0 OPERATING MANUAL

ON THE SURFACE BEFORE A DIVE

There are two Gauge Surface Main screens. The rst screen displays when there have been no dives yet or the surface interval after a dive has
exceeded 10 min. The second screen displays only during the rst ten minutes after a dive.

GAUGE SURF MAIN

(no dive yet or > 10 min post dive)

GAUGE SURF MAIN

(<10 minutes post dive)

surface time

surface time
hr:min

mode

bluetooth
on

time of day

dive #,
0 for none yet

to
Watch

max depth

GAUGE MAIN

hr:min

elapsed dive
time (min)

Mode

SELECT

ALT 1

MODE

SELECT

ALT 2

to Select an option

FLY
LOG
SET ALARMS

Exit Menu

MODE

SET UTILITIES
SET MODE
HISTORY
SERIAL NUMBER

ADV.

LIGHT

backlight

back to Main

GAUGE STANDBY MODE

The Geo 4 shall enter Standby mode 10 minutes after Gauge Surface Mode has been activated (or 10 minutes after the post dive transition period
has ended) and no button presses or dives have been initiated. Pressing a button will wake the Geo 4.0 up from Standby Mode.

NOTE: Bluetooth function shuts down during Standby Mode to save battery life.

GAUGE STANDBY MODE

(no previous dive)

GAUGE STANDBY MODE

(post dive)

hr:min countdown till

recommended safe ight time

NOTE: Gauge Surface ALT screens and Menu options are similar to those described previously for Norm Mode. See the Norm

Surface Mode chapter for further details. Features unique to Gauge Mode are described in the following sections.

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46

GEO 4.0 OPERATING MANUAL

INITIATING A DIVE

With the Geo 4.0 in Gauge Mode, a dive will commence upon descending to 5 ft (1.5 m) for longer than 5 seconds. Below is a diagram to help you
navigate Gauge Dive Mode functions. The dive will end and revert to Surface Mode upon ascent to 3 ft (0.9 m) of depth for at least 1 second.

GAUGE DIVE MAIN

SELECT

MODE

ADV.

ALT 1
ALT 2
back to
Main

GAUGE DIVE MAIN

The Gauge Dive Main provides basic information including depth, dive time, max depth, and ascent rate during the dive.

GAUGE DIVE MAIN

(Run Timer not displayed)

depth

ascent bar graph

max depth

GAUGE DIVE ALT 1

This screen only displays when the Run Timer is displayed on the Dive Main screen. Otherwise, it is bypassed. It is equal to the Gauge Dive Main
screen.

elapsed dive time
0 - 999 min

ADV.

LIGHT

backlight

GAUGE DIVE ALT 2

This screen simply tells you the current time of day and ambient temperature.

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47

GEO 4.0 OPERATING MANUAL

RUN TIMER

The Gauge Mode allows for a Run Timer to be added to the Gauge Dive Main screen.

NOTE: Once the Run Timer is added and started, it can be removed and continue to run in the background until it is again

added. Though it can only be started and stopped while it is being displayed.

ADD RUN TIMER

SELECT

MODE

MODE

RUN TIMER

SELECT

reset timer,
if on
main and
stopped

start/stop
timer, if on
main

display
run timer

ADV.

LIGHT

remove
run timer

ADV.

LIGHT

Run Timer
hr:min

DELAYED VIOLATION 3 (DV3)

If you descend deeper than the maximum functional depth*, the audible alarm will sound and the alarm LED will ash. At the same time, the up ar­row will ash and depth will only indicate dashes signifying that you are too deep. The max depth will also be represented by dashes.

* The maximum functional depth (330 ft / 100 m) is the depth at which the Geo 4.0 can properly perform calculations or provide accurate display

information.

Upon ascending above the maximum functional depth, current depth will be restored, however, max depth will continue to be displayed as dashes
for the remainder of that dive. The Log for that dive will also display dashes for max depth.

NOTE: Once the Run Timer is added and started, it can be removed and continue to run in the background until it is again

added. Though it can only be started and stopped while it is being displayed.

ashing

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FREE MODE

GEO 4.0 OPERATING MANUAL

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49

GEO 4.0 OPERATING MANUAL

FREE DIVE MODE DETAILS

• Although breathing apparatus is not utilized for free dive activities, nitrogen tissue loading remains a factor. Nitrogen loading is calculated based

upon a xed FO2 of Air.

• Since a user has the option of alternating between SCUBA and free dive activities within a 24 hour period, nitrogen calculations and the displayed
value of No Decompression Dive Time Remaining are carried over from one operating mode to the other, which permits the user to maintain
awareness of nitrogen absorption and off-gassing status.

• The mathematical models currently used in the Geo 4.0 are based on no decompression/decompression multilevel repetitive dive schedules.

• These algorithms do not take into account the physiological changes associated with the high pressures that competitive type free diving can
expose a diver to.

WARNINGS:

• Ensure that you know which operating mode is selected (Norm, Gauge, or Free) prior to commencing any dive.

• Conducting Free dives within a 24 hour period after conducting SCUBA dives, combined with the effects of multiple rapid free dive

ascents, increases your risk of decompression sickness. Such activities may result in accelerated entry into decompression which
could cause serious injury or death.

• Combining competitive type free dive activities that involve multiple descents/ascents with activities utilizing SCUBA during the

same 24 hour period is not recommended. Presently, there is no data relating to such activities.

• It is highly recommended that anyone planning to become involved in competitive type free dive activities obtain proper instruc-

tion and training from a recognized free diving trainer. It is imperative that the physiological affects be understood and the diver is
physically prepared.

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50

GEO 4.0 OPERATING MANUAL

ON THE SURFACE BEFORE A DIVE

There are two Free Surface Main screens. The rst screen displays when no dives have been made or greater than one minute after surfacing. The
second screen displays only during the rst minute after a dive.

(no dive yet or > 1 min post dive)

Surface Time
min:sec up to
59:59, then
hr:min

mode
bluetooth
on

SELECT

to Select
an option

Exit Menu

FREE SURF MAIN

ALT 1
ALT 2
CDT
SET FREE ALARMS
SET MODE
back to Main

MODE

time of day

dive # up to
99,
0 for none yet

temperature

to
Watch
Mode

FREE SURF MAIN

(< 1 min post dive)

residual

nitrogen

elapsed dive time
min:sec

FREE MAIN

SELECT

MODE

ADV.

LIGHT

backlight

FREE STANDBY MODE

The Geo 4 shall enter Standby mode 10 minutes after Free Surface Mode has been activated (or 10 minutes after the post dive transition period has
ended) and no button presses or dives have been initiated. Pressing a button will wake the Geo 4.0 up from Standby Mode.

NOTE: Bluetooth function shuts down during Standby Mode to save battery life.

FREE STANDBY MODE

ALT 1

This screen displays data from the previous dive.

Surface Interval
min:sec up to
59:59, then
hr:min

max depth

elapsed dive time
min:sec

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51

ALT 2

This screen displays current time of day, temperature, and elevation.

Watch Default Time

GEO 4.0 OPERATING MANUAL

temperature

elevation

(EL2 - EL7, blank if sea level)

COUNTDOWN TIMER (CDT)

The Geo 4.0 allows you to set a CDT time from 0:01 - 59:59 (min:sec). On the surface the CDT must be started and stopped in the CDT Status screen
by selecting ON or OFF. The CDT will run in the background, while on the surface and during dives, until it counts down to 0:00, or it is turned OFF.

When a set CDT time reaches 0:00, the audible will sound. During which time the graphic CDT will be displayed ashing on the Surface or Dive

Main until the audible is silent.

NOTE: Setting the CDT does not start the countdown. You must select ON in the CDT Status screen to start the CDT.

MODE

ADV.

decrease
value

CDT STATUS LEAD-IN

SET CDT

MODE

SELECT

LIGHT

to CDT Status

SELECT

to save
min/sec

toggle

MODE

setting

ADV.

toggle
setting

(on surface, during audible alarm)

CDT STATUS

SELECT

to select

LIGHT

OFF, ON, or SET

CDT ALARM TRIGGERED

min:sec

ADV.

LIGHT

increase
value

SET ALARMS

Within this submenu you can customize the following Free Mode alarm settings.

SET ALARMS LEAD-IN

SELECT

MODE

to Set EDT
Alarm

ADV.

LIGHT

ashing

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52

GEO 4.0 OPERATING MANUAL

1. ELAPSED DIVE TIME ALARM

The EDT (Elapsed Dive Time) Alarm sounds the audible alarm every 30 seconds while underwater in Free Dive mode.

toggle
setting

toggle

MODE

ADV.

SELECT

to select

ashing

LIGHT

OFF or ON

ELAPSED DIVE TIME
ALARM TRIGGERED

setting

2. DEPTH ALARMS 1-3

There are 3 Free Depth Alarms that can be set at progressively deeper depths, in intervals of 10 ft (1 m).

NOTE: Each successive Depth Alarm can only be set deeper than the Depth Alarm that precedes it. For

example: If Depth Alarm 1 is set for 30 ft then Depth Alarm 2 settings start at 40 ft.

SET DEPTH ALARM 1

(Depth Alarm 2 & 3 are similar)

decrease
value

SELECT

MODE

to select

DEPTH ALARM 2 TRIGGERED

(Depth Alarm (1,3) similar)

ashing

ashing

ashing

increase
value

ADV.

OFF or 30 - 330 ft
(10 - 100 m)

LIGHT

Depth Alarm 1 (2, 3)

SET MODE (OPERATION MODE)

This feature functions the same as in Norm Mode, see p. 33.

INITIATING A DIVE

With the Geo 4.0 in Free Mode, a dive will commence upon descending to 5 ft (1.5 m) for longer than 5 seconds. Below is a diagram to help you
navigate Free Dive Mode functions. The dive will end and revert to Surface Mode upon ascent to 3 ft (0.9 m) of depth for at least 1 second.

FREE DIVE MAIN

MODE

ADV.

ALT 1
ALT 2
back to
Main

ADV.

LIGHT

backlight

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53

GEO 4.0 OPERATING MANUAL

FREE DIVE MAIN

The Free Dive Main provides basic information including depth, no decompression time, dive time, temperature and nitrogen loading during the dive.

depth

No Decompression Time Remaining
0 - 599 min, all times greater than 599 display as 599

Tissue Loading

Bar Graph

temperature

elapsed dive time
min:sec

FREE DIVE ALT 1

This screen Displays the Countdown Timer status. The Countdown Timer can be started and stopped in this screen by selecting ON or OFF. After the
time runs down to 0:00, the countdown timer will reset to the original preset time.

NOTE: The Countdown Timer must be preset on the surface while in the Free Surface Mode.

SELECT

MODE

min:sec

ADV.

LIGHT

to ALT 2

ON = Start
OFF = Stop

toggle
ON/OFF

FREE DIVE ALT 2

This screen simply tells you the max depth and current time of day.

HIGH NITROGEN ALARMS

When nitrogen increases to the caution level (4 Tissue Loading Bar Graph segments), the audible alarm will sound 3 sets of 3 beeps. During this time

the Tissue Loading Bar Graph segments will ash on the Free Dive Main screen.

If nitrogen continues to increase to the Decompression level (all 5 Tissue Loading Bar Graph segments), the audible alarm will sound again. At this

time the Tissue Loading Bar Graph segments will ash, and NDC (no decompression) time will be displayed as 0 min.

When the audible alarm is silenced, the Tissue Loading Bar Graph and NDC (no decompression), values are removed. Then the message VIO (viola-

tion) and the Up Arrow ashes until on the surface.

After surfacing, the graphic VIO (violation) ashes. Then after 1 minute on the surface, the dive computer operation locks into Violation Gauge

Mode for 24 hours. Access to Watch Mode will be as usual.

TLBG ALARM DECOMPRESSION ENTRY

ashing

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VIOLATION AFTER

1 MIN ON THE SURFACE

ashing

ashing

54

REFERENCE

GEO 4.0 OPERATING MANUAL

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55

GEO 4.0 OPERATING MANUAL

UPLOADING/DOWNLOADING DATA

As previously described (p. 32), the Geo 4.0 can be paired using the Bluetooth® feature. This requires a mobile device with Bluetooth® running
Diverlog+ software.

The Settings Upload portion of the program can be used to set/change the Gases, Set AL group (Alarms), Set UTIL group (Utilities), and Set TIME
group (Time/Date) using the same Interface System. The Mode settings must be entered using the Geo 4.0 button controls.

Information available for retrieval* (download) from the Geo 4.0 includes items such as dive number, surface interval time, depth, dive time, start
dates/time, lowest temperature, sampling rate, set points, TLBG Bar Graph, and ASC Bar Graph.

*FREE Dive information is only available using the DiverLog + application.

Refer to the Diverlog+ software application for further instruction on linking your Geo 4.0 to your mobile device.

wet contact

wet contacts

low pressure
sensor

CARE AND CLEANING

Protect your Geo 4.0 from shock, excessive temperatures, exposure to chemicals, and tampering. Protect the lens against scratches with an Instru­ment Lens Protector. Small scratches will naturally disappear underwater.

• Soak and rinse the Geo 4.0 in fresh water at the end of each day of diving, and check to ensure that the areas around the Low Pressure (Depth)
Sensor, wet contacts, and buttons are free of debris or obstructions.

• To dissolve salt crystals, use lukewarm water or a slightly acidic bath (50% white vinegar/50% fresh water). After removal from the bath, place

the Geo 4.0 under gently running fresh water. Towel dry before storing.

• Keep your Geo 4.0 cool, dry, and protected during transport.

INSPECTIONS AND SERVICE

Your Geo 4.0 should be inspected annually by an Authorized Oceanic Dealer who will perform a factory prescribed function check and inspection
for damage or wear. To keep the 2 year limited warranty in effect, this inspection must be completed one year after purchase (+/- 30 days). Oce­anic recommends that you continue to have an inspection performed every year to ensure it is working properly. The costs of annual inspections, or
inspections relating to water tight integrity, are not covered under the terms of the 2 year limited warranty.

To Obtain Service:
Take your Geo 4.0 to an Authorized Oceanic Dealer or send it to the nearest Oceanic Regional Facility.
To return your Geo 4.0 to Oceanic:

• Record all dive data in the Log and/or download the data stored in memory. All data will be erased during factory service.

• Package it using a protective cushioning material.

• Include a legible note stating the specic reason for return, your name, address, daytime phone number, serial number(s), and a copy of your

original sales receipt and Warranty Registration Card.

• Send freight prepaid and insured using a traceable method to the nearest Oceanic Regional Facility, or to Oceanic USA.

• If shipping to Oceanic USA, obtain an RA (Return Authorization) number by contacting Oceanic at 888-270-8595 or followthe instructions at
https://www.oceanicworldwide.com/us/support/returns/.

• Non-warranty service must be prepaid. COD is not accepted.

• Additional information is available at the Oceanic web site OceanicWorldwide.com

BATTERY REPLACEMENT

CAUTION: The procedures that follow must be closely adhered to avoid entrance of water into the unit. Damage due to improper

battery replacement (or subsequent leakage of moisture into the unit) is not covered by the Geo 4.0's warranty.

The battery compartment should be opened only in a dry and clean environment with extreme care taken to prevent the entrance of moisture or
dust.

As an additional precautionary measure to prevent formation of moisture in the battery compartment, it is recommended that the battery be
changed in an environment equivalent to the local outdoor temperature and humidity (e.g., do not change the battery in an air conditioned environ­ment then take it outside during a hot sunny day).

Inspect the buttons, lens, and housing to ensure they are not cracked or damaged. If there is any sign of moisture in the Geo 4.0, DO NOT attempt
to use it for diving until it receives proper service by the Oceanic factory or an authorized regional distributor.

Data Retention
When the battery is removed, settings and nitrogen/oxygen calculations for repetitive dives will be retained in volatile memory until a new battery is
installed.

All parts needed for the battery change are provided in the Geo 4.0 Battery Kit available from your Oceanic Dealer.

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56

GEO 4.0 OPERATING MANUAL

Battery Removal

• It is not necessary to remove the wrist straps.

• Locate the battery compartment on the back of the unit.

• Rotate the battery cover clockwise 10 degrees using the special Battery Cover Tool, or by pushing the lower portion to the left while pushing the
upper portion to the right using your thumbs.

• Lift the cover and O-ring up and away from the housing.

• Using care not to damage the contact, slide the battery up and out of the left side of the compartment.

• Turn the case to one side to drop the battery into your hand. If necessary, gently loosen it with the tip of your nger. DO NOT use tools to pry it

out, or short the positive (+) top of the Battery to the negative ( - ) contact under it.

• Discard the battery according to local regulations governing disposal of lithium batteries.

BATTERY REMOVALCOVER REMOVAL

Inspection

• Closely check all of the sealing surfaces for any signs of damage that might impair proper sealing.

• Inspect the button, lens, and housing to ensure they are not cracked or damaged.

WARNINGS:If damage or corrosion is found, return your Geo 4.0 to an authorized Oceanic dealer, and DO NOT attempt to use it

until it has received factory prescribed service.

• Remove the cover O-ring. Discard, and do not attempt to reuse it.

CAUTION: DO NOT use tools to remove the O-ring. To ensure proper sealing, O-ring replacement is required each time the bat-

tery is replaced.

REMOVE O-RING

Battery Installation

CAUTION: The O-ring must be a genuine Oceanic part that can be purchased from an authorized Oceanic dealer. Use of any

other O-ring will void the warranty.

• Very lightly lubricate the new O-ring with silicone grease and place it in the O-ring groove of the cover.

• Place a new 3 volt type CR2430 lithium battery, negative side down into the battery cavity. Ensure that it is evenly positioned.

• Carefully place the battery cover (with O-ring) into position on the rim of the battery compartment, then press it evenly and completely down into
place.

• Maintain the battery cover securely in place and turn it counter clockwise 10 degrees using the special battery cover tool, or by pushing the lower
portion to the right while pushing the upper portion to the left.

REPLACE O-RING INSTALL BATTERY INSTALL COVER

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57

GEO 4.0 OPERATING MANUAL

Testing

• Activate the unit and ensure that the LCD is clear and sharp in contrast. If any portions are missing or appear dim, or if a low battery condition is
indicated, return the Geo 4.0 to an authorized Oceanic dealer for evaluation before use.

• Verify all set points prior to diving.

ALTITUDE SENSING AND ADJUSTMENT

Altitude (i.e., ambient pressure) is measured upon activation and every 15 minutes until a dive is made.

• Measurements are only taken when the unit is dry.

• Two readings are taken, the second reading 5 seconds after the rst. The readings must be within 1 foot (30 cm) of each other to record that

ambient pressure as the current Altitude.

• No adjustments are made during any time that the Wet Contacts are bridged.

• When diving in high altitude waters from 3,001 to 14,000 feet (916 to 4,270 meters), the Geo 4.0 automatically adjusts to these conditions pro­vidingcorrected Depth, and reduced No Deco and O2 Times at intervals of 1,000 feet (305 meters).

• When the Conservative Factor is set On, NDLs are calculated based upon the next higher 3,000 foot (915 meter) Altitude.

• At Sea Level, calculations are based upon an Altitude of 6,000 feet.

• All adjustments for Altitudes greater than 11,000 feet (3,355 meters) are then made to allowable dive times for 14,000 feet (4,270 meters).

• The Geo 4.0 will not function as a Dive Computer above 14,000 feet (4,270 meters).

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TECHNICAL DATA

GEO 4.0 OPERATING MANUAL

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GEO 4.0 OPERATING MANUAL

DSAT BASED NDLS (HR:MIN)

Altitude 0 3001 4001 5001 6001 7001 8001 9001 10001 110 01 12001 13001
(feet) to to to to to to to to to to to to
3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000
Depth
(FT)
30 4:20 3:21 3:07 2:55 2:45 2:36 2:28 2:21 2:15 2:10 2:04 1:58
40 2:17 1:43 1:36 1:30 1:25 1:20 1:16 1:12 1:09 1:06 1:03 1:01
50 1:21 1:03 1:00 0:58 0:55 0:52 0:48 0:45 0:43 0:41 0:39 0:37
60 0:57 0:43 0:40 0:38 0:36 0:34 0:33 0:31 0:30 0:29 0:28 0:27
70 0:40 0:31 0:30 0:28 0:27 0:26 0:24 0:23 0:22 0:20 0:19 0:18
80 0:30 0:24 0:23 0:21 0:20 0:19 0:18 0:17 0:16 0:16 0:14 0:13
90 0:24 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:10
100 0:19 0:15 0:14 0:13 0:12 0:11 0:10 0:10 0:09 0:09 0:08 0:08
110 0:16 0:12 0:11 0:10 0:09 0:09 0:08 0:08 0:08 0:07 0:07 0:07
120 0:13 0:09 0:09 0:08 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06
130 0:11 0:07 0:07 0:07 0:06 0:06 0:06 0:06 0:05 0:05 0:05 0:05
140 0:09 0:07 0:07 0:06 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05
150 0:08 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 0:04
160 0:07 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04
170 0:07 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:04 0:03
180 0:06 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03
190 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03

DSAT BASED NDLS (HR:MIN)

Altitude 0 916 1221 1526 1831 2136 2441 2 746 3051 3356 3661 3966
(meters) to to to to to to to to to to to to
915 1220 1525 1830 2135 2440 2 745 3050 3355 3660 3965 4270
Depth
(M)
9 4:43 3:37 3:24 3:10 2:58 2:48 2:39 2:31 2:24 2:18 2:12 2:07
12 2:24 1:52 1:44 1:37 1:30 1:25 1:21 1:17 1:13 1:10 1:07 1:04
15 1:25 1:06 1:03 1:00 0:57 0:55 0:52 0:49 0:46 0:43 0:41 0:39
18 0:59 0:45 0:42 0:40 0:38 0:36 0:34 0:32 0:31 0:30 0:29 0:28
21 0:41 0:33 0:31 0:29 0:28 0:27 0:26 0:24 0:23 0:21 0:20 0:19
24 0:32 0:26 0:24 0:22 0:21 0:20 0:19 0:18 0:17 0:16 0:15 0:14
27 0:25 0:19 0:18 0:17 0:16 0:16 0:14 0:13 0:12 0:12 0:11 0:10
30 0:20 0:16 0:15 0:13 0:12 0:12 0:11 0:10 0:10 0:09 0:09 0:08
33 0:17 0:12 0:11 0:11 0:10 0:09 0:09 0:08 0:08 0:08 0:07 0:07
36 0:14 0:10 0:09 0:09 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06
39 0:11 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:06 0:05 0:05
42 0:09 0:07 0:07 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05
45 0:08 0:06 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04
48 0:07 0:06 0:06 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04
51 0:06 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:04
54 0:06 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03
57 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03

(IMPERIAL)

(METRIC)

Display: Range:

• SEA = Level 1 (Sea Level) 0 to 3,000 feet (0 to 915 meters)

• L2 = Level 2 3,001 to 5,000 feet (916 to 1,525 meters)

• L3 = Level 3 5,001 to 7,000 feet (1,526 to 2,135 meters)

• L4 = Level 4 7,001 to 9,000 feet (2,136 to 2,745 meters)

• L5 = Level 5 9,001 to 11,000 feet (2,746 to 3,355 meters)

• L6 = Level 6 11,001 to 13,000 feet (3,356 to 3,965 meters)

• L7 = Level 7 > 13,000 feet (3,965 meters)

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

ALTITUDE LEVELS

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GEO 4.0 OPERATING MANUAL

Z+ BASED NDLS (HR:MIN)

(IMPERIAL)

Altitude 0 3001 4001 5001 6001 7001 8001 9001 10001 110 01 12001 13001
(feet) to to to to to to to to to to to to
3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000
Depth
(FT)
30 3:17 2:30 2:21 2:14 2:08 2:02 1:57 1:52 1:47 1:39 1:34 1:29
40 1:49 1:21 1:15 1:11 1:08 1:05 1:02 1:00 0:57 0:55 0:53 0:51
50 1:05 0:53 0:51 0:49 0:47 0:44 0:42 0:39 0:37 0:35 0:34 0:33
60 0:48 0:37 0:35 0:33 0:32 0:30 0:28 0:26 0:24 0:23 0:22 0:21
70 0:35 0:26 0:24 0:23 0:21 0:20 0:19 0:18 0:17 0:16 0:16 0:14
80 0:26 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:11 0:10
90 0:19 0:15 0:14 0:13 0:12 0:11 0:10 0:10 0:09 0:09 0:08 0:08
100 0:16 0:11 0:10 0:10 0:09 0:09 0:08 0:08 0:07 0:07 0:07 0:07
110 0:12 0:09 0:08 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:05
120 0:10 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05
130 0:08 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04
140 0:07 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04
150 0:06 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03
160 0:06 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03
170 0:05 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03 0:03
180 0:05 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03 0:03 0:03 0:03
190 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03 0:03 0:03 0:03 0:00

Z+ BASED NDLS (HR:MIN)

Altitude 0 916 1221 1526 1831 2136 2441 2 746 3051 3356 3661 3966
(meters) to to to to to to to to to to to to
915 1220 1525 1830 2135 2440 2 745 3050 3355 3660 3965 4270
Depth
(M)
9 3:37 2:41 2:31 2:23 2:16 2:10 2:04 1:59 1:54 1:50 1:43 1:37
12 1:55 1:27 1:21 1:15 1:12 1:08 1:05 1:03 1:00 0:58 0:55 0:54
15 1:08 0:55 0:53 0:51 0:49 0:47 0:44 0:42 0:39 0:37 0:36 0:34
18 0:50 0:39 0:37 0:35 0:33 0:32 0:30 0:28 0:26 0:24 0:23 0:22
21 0:36 0:28 0:26 0:24 0:23 0:21 0:20 0:19 0:18 0:17 0:16 0:16
24 0:27 0:20 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:11
27 0:20 0:16 0:15 0:13 0:12 0:11 0:11 0:10 0:09 0:09 0:09 0:08
30 0:16 0:12 0:11 0:10 0:09 0:09 0:09 0:08 0:08 0:07 0:07 0:07
33 0:13 0:09 0:09 0:08 0:08 0:07 0:07 0:07 0:07 0:06 0:06 0:06
36 0:10 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05
39 0:09 0:07 0:06 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04
42 0:08 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04
45 0:06 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:04
48 0:06 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03
51 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03
54 0:05 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03 0:03 0:03
57 0:05 0:04 0:04 0:03 0:03 0:03 0:03 0:03 0:03 0:03 0:03 0:03

(METRIC)

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SPECIFICATIONS

CAN BE USED AS

• Watch

• Dive Computer (Air or Nitrox)

• Digital Depth Gauge/Timer

• Free Dive Computer

DIVE COMPUTER PERFORMANCE

• Buhlmann ZHL-16c based PZ+, or DSAT based, algorithm.

• No Decompression limits closely follow PADI RDP.

• Decompression in agreement with Buhlmann ZHL-16c and French MN90.

• No Decompression Deep Stops - Morroni, Bennett.

• Decompression Deep Stops (not recommended) - Blatteau, Gerth, Gutvik.

• Altitude - Buhlmann, IANTD, RDP (Cross).

• Altitude corrections and O2 limits based on NOAA tables.

OPERATIONAL PERFORMANCE
Function: Accuracy:

• Depth ±1% of full scale

• Timers 1 second per day

Dive Counter:

• Norm/Gauge displays Dives #1 to 24.

• Resets to Dive #1, upon diving (after 24 hours with no dives).

Dive Log Mode:

• Stores 24 most recent DIVE/GAUGE dives in memory for viewing

• After 24 dives, adds 25th dive in memory and deletes the oldest dive

GEO 4.0 OPERATING MANUAL

Altitude:

• Operational from sea level to 14,000 feet (4,270 meters) elevation.

• Measures ambient pressure every 30 minutes in Watch mode, when Dive Computer mode is accessed, and every 15 minutes while in DC Surface

modes.

• Does not measure ambient pressure when wet.

• Compensates for Altitudes above sea level beginning at 3,001 feet (916 meters) elevation and every 1,000 feet (305 meters) higher.

Power:

• (1) 3 volt, CR2430, lithium battery (Panasonic or equivalent)

• Shelf life Up to 7 years (dependent on battery manufacturer)

• User replacement battery (annual recommended)

• Use Life 1 year or 300 dive hours if (qty: 2) 1 hour dives per dive day.

Battery Indicator:

• Warning - icon on solid at 2.75 volts, Battery change recommended

• Alarm - icon on ashing at 2.50 volts, change the Battery

Operating Temperature:

• Out of the water - between 20 °F and 140 °F (-6.6 and 60 °C).

• In the water - between 28 °F and 95 °F (-2.2 and 35 °C).

BAR GRAPHS:

Nitrogen Loading Bar Graph segments

• No Decompression Normal Zone 1 to 3

• No Decompression Caution Zone 4

• Decompression Zone 5 (all)

VARI

• Normal zone 3 segments

• Caution zone 4 segments

• Too Fast zone 5 segments

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SPECIFICATIONS (CONTINUED)

NUMERIC DISPLAYS: Range: Resolution:

• Dive Number 0 to 24 1

• Depth 0 to 330 ft (100 m) 1 FT (0.1/1 M)

(0 - 99.9 M, > 99.9 then 100 M)

• FO2 Set Point Air, 21 to 100 % 1 %

• PO2 Value 0.00 to 5.00 ATA 0.01 ATA

• Dive Time Remaining 0 to 599 min, display 599 if >599 min 1 minute

• Total Ascent Time 0 to 999 min, display - - if >999 min 1 minute

• No Decompression Deep Stop Time 2:00 to 0:00 min:sec 1 second

• No Decompression Safety Stop Time 5:00 to 0:00 min:sec 1 second

• Decompression Stop Time 0 to 999 min 1 minute

• DIVE/GAUGE Elapsed Dive Time 0 to 999 min 1 minute

• Free Elapsed Dive Time (< 10 min) 0:00 to 9:59 min:sec 1 second

• Free Elapsed Dive Time (≥ 10 min) 10 to 999 min 1 minute

• Surface Interval Time 0:00 to 23:59 hr:min 1 minute

• Free Surface Interval Time 0:00 to 59:59 min:sec, 1 second
then 1:00 to 23:59 hr:min 1 minute

• Time to Fly & Desaturate 23:50 to 0:00 hr:min* 1 minute

* starting 10 min after the dive

• Temperature -18 to 60° C (0 to 99° F) 1°
if outside of temp range, then displays - -

• Time of Day 0:00 to 23:59 hr:min 1 minute

• Free Countdown Timer 59:59 to 0:00 min:sec 1 second

• Violation Countdown Timer 23:50 to 0:00 hr:min 1 minute

GEO 4.0 OPERATING MANUAL

MAX FUNCTIONAL DEPTH: Limit:

Norm/Gauge/Free 330 ft (100 m)

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ABBREVIATIONS/TERMS

GEO 4.0 OPERATING MANUAL

AL = Alarm
AR = Ascent Rate
ATA = Atmospheres Absolute

AUD = Audible
BAR = Metric Unit Of Pressure

BATT (BAT) = Battery

CHG = Change

CONSERV = Conservative Factor
CV = Conditional Violation
DECO = Decompression
DESAT = Desaturation

DFLT = Default

DS = Deep Stop

DSAT = Algorithm type
DTR = Dive Time Remaining
DURA = Duration (backlight)

DV = Delayed Violation
EDT = Elapsed Dive Time
EL = Elevation (altitude)

FO2 = Fraction of Oxygen (%)

FORM = Format (date, time)
FPM = Feet Per Minute
FT = Feet (depth)
HR = Hour
M = Meters (depth)
MAX = Maximum

M.D (D.M) = Month.Day (Day.Month)
MIN (min) = Minutes (time)
MPM = Meters Per Minute
NDC = No Deco DTR
NDL = No Deco Limit
NO = Number
NORM = Normal Dive Mode

O2 = Oxygen

O2SAT = % O2

OTR = Oxygen Time Remaining
PDPS = Pre Dive Planning Sequence
PO2 = Partial Pressure of O2 (ATA)
SAFE = Safety (stop)

SAT = Time to Desaturate
SEC (sec) = Seconds (time)

SI = Surface Interval

SN = Serial Number

SS = Safety Stop
SR = Sampling Rate
SURF = Surface
TLBG (TL) = Tissue Loading Bar Graph
TTS = Time To Surface

VARI = Variable Ascent Rate Indcator

VGM = Violation Gauge Mode

VIO = Violation

Z+ = Algorithm type

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GEO 4.0 OPERATING MANUAL

INSPECTION / SERVICE RECORD

Serial Number: ___________________________________________________________________________________________________

Firmware Rev: ___________________________________________________________________________________________________

Date of Purchase: ___________________________________________________________________________________________________

Purchased from: ___________________________________________________________________________________________________

Below to be lled in by an Authorized Oceanic Dealer:

Date Service Performed Dealer/Technician

© Pelagic, 2019 Doc. No. 12-5670-r01 (2/27/18)

OCEANIC WORLD WIDE

OCEANIC USA

1540 North 2200 West Salt Lake City,

Utah, 84116

Tel: [phone]

Web: www.OceanicWorldwide.com

OCEANIC EUROPE

Dieselstrasse 2

D-83043 Bad Aibling, Germany

Tel: [phone]

[e-mail]

65

Geo 4.0

GEO 4.0 OPERATING MANUAL

DIVE COMPUTER

OPERATING MANUAL

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