Oceanic VT 3 User manual

VT 3
dive computer
operating manual

3
CONTENTS
WARRANTY, NOTICES, DECOMPRESSION MODEL ....................................................................................................7
FCC ID ............................................................................................................................................................................... 8
INTRODUCTION AND GENERAL FEATURES AND DISPLAYS .................................................................................... 9
INTERACTIVE CONTROL CONSOLE ..................................................................................................................... 10
OPERATING MODE STRUCTURE ........................................................................................................................... 11
AUDIBLE ALARM ...................................................................................................................................................... 12
SMARTGLO BACKLIGHT ........................................................................................................................................ 1
POWER SUPPLY ...................................................................................................................................................... 15
BAR GRAPHS ........................................................................................................................................................... 17
PC INTERFACE ......................................................................................................................................................... 19
SYMBOLS AND ALPHA NUMERIC GRAPHICS ...................................................................................................... 19
ALPHA / NUMERIC DISPLAYS ................................................................................................................................ 20
Tank Pressure Display .......................................................................................................................................... 20
Depth Displays ...................................................................................................................................................... 20
Air Time Remaining Display ................................................................................................................................. 20
Date. Time, and Temperature Displays ................................................................................................................ 21
FREE Dive M de Displays ................................................................................................................................... 21
SURFACE SEQUENCE AND OPERATING MODES ..................................................................................................... 23
OPERATING MODES ................................................................................................................................................ 2
SURFACE MODE ...................................................................................................................................................... 2
NORM (N rmal) Surface Main Display ................................................................................................................ 25
NORM Surface Main Butt n Operati ns .............................................................................................................. 26
VT3 Battery Status .............................................................................................................................................. 27
Transmitter Status .............................................................................................................................................. 27
SET MODES .............................................................................................................................................................. 28
SET F GROUP (FO2) ................................................................................................................................................ 28
Set FO2 f r NORM Nitr x Dives .......................................................................................................................... 29

4
CONTENTS (continued)
Set FO2 GAS 1 ..................................................................................................................................................... 31
Set FO2 GAS 2 ..................................................................................................................................................... 32
Set FO2 GAS 3 ..................................................................................................................................................... 33
Set FO2 50% Default ........................................................................................................................................... 34
SET A GROUP (NORM/GAUG ALARMS) ................................................................................................................ 3
Set Audible Alarm ................................................................................................................................................. 35
Set Depth Alarm ................................................................................................................................................... 36
Set EDT (Elapsed Dive Time) Alarm ................................................................................................................... 37
Set TLBG (Tissue L ading Bar Graph) Alarm ...................................................................................................... 38
Set DTR (Dive Time Remaining) Alarm ................................................................................................................ 39
Set Turn Pressure Alarm (TMT1) ......................................................................................................................... 40
Set End Pressure Alarm ....................................................................................................................................... 41
Set PO2 Alarm ...................................................................................................................................................... 42
SET U GROUP (UTILITIES) ...................................................................................................................................... 3
Set Wet Activati n ................................................................................................................................................ 44
Set Units f Measure ............................................................................................................................................ 45
Set NORM Safety St p ......................................................................................................................................... 46
Set C nservative Fact r ....................................................................................................................................... 47
Set Backlight Durati n .......................................................................................................................................... 48
Set Sampling Rate ................................................................................................................................................ 49
Set TMT1 (Transmitter 1 Link C de) .................................................................................................................... 50
Set TMT (Transmitter) 2-3 Use ............................................................................................................................ 52
Set TMT2 (Transmitter 2 Link C de) ................................................................................................................... 53
Set TMT3 (Transmitter 3 Link C de) ................................................................................................................... 55
SET T GROUP (TIME/DATE) .................................................................................................................................... 57
Set H ur F rmat ................................................................................................................................................... 58
Set Time ................................................................................................................................................................ 58
Set Date ................................................................................................................................................................ 59
SERIAL NUMBER (VT3) ........................................................................................................................................... 60
NORM SURF ALT DISPLAY (SURFACE ALTERNATE) ........................................................................................... 61
NORM PLAN MODE .................................................................................................................................................. 61
FLY MODE ................................................................................................................................................................. 6
SAT MODE (DESATURATE) ..................................................................................................................................... 66

5
CONTENTS (continued)
NORM/GAUG LOG MODE ........................................................................................................................................ 67
NORM/GAUG HISTORY MODE ................................................................................................................................ 72
OVERVIEW OF DISPLAYED SYMBOLS AND ICONS ............................................................................................ 7
OVERVIEW OF DIVE MODE OPERATION ................................................................................................................... 75
POSITIONING OF THE VT3 ..................................................................................................................................... 77
Link Interrupti n Underwater ................................................................................................................................ 77
DIVE TIME REMAINING (DTR) ................................................................................................................................. 78
N Dec mpressi n Dive Time Remaining (NDC) ................................................................................................ 79
Oxygen Accumulati n Time Remaining (OTR) .................................................................................................... 80
Air Time Remaining (ATR) .................................................................................................................................... 80
Air Time Remaining Alarm .................................................................................................................................... 81
ASCENT RATE ALARM ............................................................................................................................................ 82
CONTROL OF DISPLAYS ......................................................................................................................................... 83
WET CONTACTS ....................................................................................................................................................... 8
NORM TYPE DIVE MODES ........................................................................................................................................... 85
NORM NO DECOMPRESSION DIVE MODE ........................................................................................................... 86
NORM Dive N Dec Safety St p ....................................................................................................................... 89
DECOMPRESSION DIVE MODE ........................................................................................................................ 91
VIOLATION MODES .................................................................................................................................................. 95
NORM HIGH PO2 .................................................................................................................................................... 100
HIGH OXYGEN ACCUMULATION .......................................................................................................................... 101
SUMMARY OF NORM/GAUG WARNING AND ALARM MESSAGES .................................................................. 102
SWITCHING GAS MIXES AND BUDDY PRESSURE CHECK .................................................................................... 103
SWITCHING GAS MIXES (NORM ONLY) .............................................................................................................. 10
BUDDY PRESSURE CHECK (NORM ONLY) ......................................................................................................... 109
NORM POST DIVE MODES ......................................................................................................................................... 113
TRANSITION PERIOD ............................................................................................................................................ 11
AFTER THE TRANSITION PERIOD ....................................................................................................................... 116

6
CONTENTS (continued)
GAUGE OPERATING MODE ....................................................................................................................................... 117
GAUG SURFACE DISPLAYS .................................................................................................................................. 118
GAUG DIVE DISPLAYS .......................................................................................................................................... 119
FREE DIVE OPERATING MODE ................................................................................................................................. 121
FREE SURFACE DISPLAYS ................................................................................................................................... 122
FREE COUNTDOWN TIMER (CDT) ....................................................................................................................... 12
SET FREE CDT ....................................................................................................................................................... 126
SET FREE EDT (ELAPSED DIVE TIME) ALARM .................................................................................................. 127
SET FREE DEPTH ALARMS .................................................................................................................................. 128
FREE DIVE DISPLAYS ............................................................................................................................................ 132
FREE DIVE ALARMS .............................................................................................................................................. 133
ENTRY INTO DECO DURING A FREE DIVE ......................................................................................................... 136
REFERENCE ................................................................................................................................................................. 137
UPLOADING SETTINGS AND DOWNLOADING DATA ........................................................................................ 138
PC C mpatibility Requirements .......................................................................................................................... 139
CARE AND CLEANING ........................................................................................................................................... 1 0
INSPECTIONS AND SERVICE ............................................................................................................................... 1 0
BATTERY REPLACEMENT .................................................................................................................................... 1 2
INSTALLING A TRANSMITTER ON A REGULATOR ............................................................................................ 1 8
TRANSMITTER COMPATIBILITY WITH NITROX .................................................................................................. 1 8
ALTITUDE SENSING AND ADJUSTMENT ............................................................................................................ 1 9
CHARTS OF NO DECOMPRESSION LIMITS AT ALTITUDE ................................................................................ 150
CHART OF OXYGEN EXPOSURE LIMITS ............................................................................................................ 151
SPECIFICATIONS ................................................................................................................................................... 152
ADDITIONAL INFORMATION PERTAINING TO FREE DIVE MODE .................................................................... 159
INSPECTION/ SERVICE RECORD ......................................................................................................................... 160
FULL DISPLAY ........................................................................................................................................................ 161
OCEANIC WORLD WIDE ....................................................................................................................................... 162
Pay special attention to items marked
with this Warning symbol.

7
LIMITED TWO-YEAR WARRANTY
For details, refer to the Product Warranty Registration Card provided. Register on-line at www.OceanicWorldwide.com
COPYRIGHT NOTICE
This operating manual is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing
from Oceanic / 2002 Design.
VT3 Operating Manual, Doc. No. 12-2705
© 2002 Design, 2006
San Leandro, CA USA 94577
TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE
Oceanic, the Oceanic logotype, the Oceanic 'O' symbol, VT3, the VT3 logo, Air Time Remaining (ATR), Diver Replace-
able Batteries, Graphic Diver Interface, Tissue Loading Bar Graph (TLBG), Pre Dive Planning Sequence (PDPS),
SmartGlo, Set Point, Control Console, Turn Gas Alarm, and OceanLog are all registered and unregistered trademarks ,
trade names, and service marks of Oceanic. All rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Air Time Remaining (U.S. Patent no. 4,586,136 and 6,543,444) and Data Sensing and Processing Device (U.S. Patent
no. 4,882,678). Set TLBG Alarm and other patents pending. User Setable Display (U.S. Patent no. 5,845,235) is
owned by Suunto Oy (Finland).
DECOMPRESSION MODEL
The programs within the VT3 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 VT3 dive computer model is
based upon the latest research and experiments in decompression theory. Still, using the VT3, just as using the
U.S. Navy (or other) No Decompression Tables, is no guarantee of avoiding decompression sick-
ness, i.e. the bends. Every divers physiology is different, and can even vary from day to day. No machine can
predict how your body will react to a particular dive profile.

8
WARNING: If your VT3 stops working for any reason while oper-
ating as a Dive Computer, it is important that you have anticipated
this possibility and are prepared for it. This is an important rea-
son for not pushing the no decompression and oxygen exposure
limits, and a critical reason to avoid entering decompression. If
you dive in situations where your trip would be ruined or your
safety would be jeopardized by losing the use of your VT3, a
backup instrument system is highly recommended.
FCC ID: MH8A
FCC COMPLIANCE:
This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1.) this equipment may not
cause harmful interference, and 2.) this equipment must accept any interference received, including interference that may cause undesired
operation.
FCC INTERFERENCE STATEMENT:
This equipment has been tested and found to comply with the limits for an Intentional Radiator, a Class B Digital Device, pursuant to Part
15 of FCC Rules, Title 47 of the Code of Federal Regulations. These rules are designed to provide reasonable protection against harmful
interference in a commercial or residential installation. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
There is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and receiver.
 Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
 Consult the dealer or an experienced radio/TV technician.
Warning: Changes or modifications to this unit not expressly approved by Oceanic/2002 Design could
void the user's authority to operate the equipment.

9
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
INTRODUCTION
AND
GENERAL FEATURES AND DISPLAYS

10
INTRODUCTION
Welcome to OCEANIC and thank you for choosing the VT3 !
It is extremely important that you read this Operating Manual in sequence and understand
it completely before attempting to use the VT3 as a dive computer.
It is equally important that you read the Oceanic Dive Computer Safety and Reference
Manual (Doc. No. 12-2262) provided with your VT3. It contains information that you must
become familiar with prior to diving with your VT3.
Remember that technology is no substitute for common sense, and a dive computer only
provides the person using it with data, not the knowledge to use it.
INTERACTIVE CONTROL CONSOLE
The Interactive Control Console consists of 3 Control Buttons that allow you to select mode
options and access specific information. They are also used to link the Transmitter(s), enter
Settings, activate the Backlight, and acknowledge the Audible Alarm.
Throughout this manual they will be referred to as the M, S, and A buttons.
 Left/Front - Mode (M) button
 Right/Front - Advance (A) button
 Right/Side - Select (S) button
MA
S

11
OPERATING MODE STRUCTURE
The M button is used to access 3 operating Modes (Fig. 1) that
include NORM (Normal Air/Nitrox Dive Computer), GAUG
(Digital Gauge Mode), and FREE (Free Dive Mode).
The screens of the Main Modes and Sub Modes will remain on
display until a button is pressed to access another screen or
Mode, activate a sequence, or for 2 minutes if no button is
pressed.
When Wet Activation is set On, the VT3 will enter the selected
Dive Mode upon descent to 5 FT (feet) /1.5 M (meters), regard-
less of what surface screen is displayed at the time.
WARNING: When Wet Activation is set OFF, the
VT3 must be activated by push button prior to
the first dive of a new series. Commencing a
dive will not activate Dive Mode unless Wet
Activation is set ON or the unit is activated.
Entering Settings and Plan Mode are available in NORM SURF
Mode which also allows access to Battery/Transmitter Status,
Fly, Desat, Log, and History Modes. Tank Pressure is displayed
if a Transmitter is active and Linked with the VT3.
Fig. 1 - Operating M des
NORM (N rmal Air/Nitr x)
FREE (M de)
GAUG (Digital Gauge M de)

12
GAUG Surface Mode allows access to Battery/Transmitter Status, Fly, Log, and History
Modes. It also displays Tank Pressure.
FREE Mode allows access to sub modes by first accessing NORM Surface Mode. It does
not display Tank Pressure.
Once a dive is made in GAUG Operating Mode, the VT3 is locked into that Mode for 24
hours after the dive.
The VT3 also features 2 modes for use of Transmitter Pressure. A setting allows you to
choose whether Transmitters 2 and 3 are for your use (SELF) or for checking 1 or 2 Bud-
dies' Tank Pressure(s). The setting remains fixed until changed in the NORM/GAUG SET
U menu.
AUDIBLE ALARM
Most warning situations that activate the Audible Alarm while operating in NORM or
GAUG Mode cause the VT3 to emit 1 beep per second for 10 seconds, or until the situa-
tion is corrected, or it is acknowledged by momentarily pressing and releasing the S button
(less than 2 seconds). After being acknowledged and the situation corrected, the Alarm
will sound again upon reentry into the warning situation, or entry into another type of
warning situation.
FREE Dive Mode has its own set of Alarms which emit 3 short beeps either 1 or 3 times
which cannot be acknowledged or set Off.

13
A red LED Warning Light, located on the left side of the housing, is synchronized with the
Audible Alarm. It will flash as the Audible Alarm sounds. It will turn Off when the Alarm is
acknowledged or the situation is corrected. The Audible and LED will not be active if the
Alarm is Set OFF (a group A setting).
Situations that will activate the NORM/GAUG 10 second Alarm include -
 Air Time Remaining (ATR) at 5 minutes, then again at 0 minutes.
 ATR becomes less than No Deco and O2 Time Remaining for 1 minute.
 Turn Pressure at the Set Point selected (Transmitter 1).
 End Pressure at the Set Point selected (active Transmitter).
 Descent deeper than the Max Depth Set Point selected.
 Dive Time Remaining at the Set Point selected.
 Elapsed Dive Time at the Set Point selected.
 High PO2 of 1.60 ATA or the Set Point selected.
 High O2 of 300 OTU (single or daily exposure).
 Tissue Loading Bar Graph at the segment Set Point selected.
 NORM/GAUG Ascent Rate exceeds 60 FPM (18 MPM) when deeper than 60 FT (18
M), or 30 FPM (9 MPM) at 60 FT (18 M) and shallower.
 Loss of the active Transmitter Link signal for more than 15 seconds during a dive.
 Entry into Decompression Mode (Deco).
 Conditional Violation (above a required Deco Stop Depth for less than 5 minutes).
 Delayed Violation (above a required Deco Stop Depth for more than 5 minutes).
 Delayed Violation (a Deco Stop Depth greater than 60 FT/18 M is required).
 Delayed Violation (Maximum Operating Depth of 330 FT/100 M is exceeded).
 A Gas Switch to another tank would expose the diver to PO2 greater than 1.60 ATA.

14
A single short beep (which cannot be disabled) is emitted for the following -
 Upon completion of a Hot Swap battery change.
 Change from Delayed to Full Violation 5 minutes after the dive.
3 short beeps (which cannot be disabled) are emitted for the following -
 FREE Dive Elapsed Dive Time Alarm (3 beeps every 30 seconds if set On).
 FREE Dive Depth Alarms 1/2/3 (set sequentially deeper) - each 3 beeps 3 times.
 FREE Dive TLBG Alarm (Caution zone, 7 segments) - 3 beeps 3 times.
 Entry into Deco during a FREE Dive (Permanent Violation) - 3 beeps 3 times.
 Free Dive Mode Countdown Timer reaches 0:00 - 3 beeps 3 times.
During the following NORM Dive situations, the 10 second Audible Alarm will not turn off
when acknowledged -
 Ascending above a required Decompression Ceiling Stop Depth for more than 5
minutes (referred to as a Delayed Violation).
 Decompression requires a Ceiling Stop Depth of 70 FT/21 M or deeper.
 Being on the Surface for 5 minutes after a Conditional Violation.
SMARTGLO® BACKLIGHT
To activate the SmartGlo Backlight - press the S button.
 If ambient light level is low, the Backlight will activate and illuminate the display for
button depression time* plus the user set Duration time of 0, 5, or 10 seconds, for a
maximum of 20 seconds.
(*The Backlight will turn Off if the button is depressed for more than 10 seconds.)
 Press the button again to activate as desired.

15
NOTE: Extensive use of the Backlight reduces
estimated Battery life. Also, the Backlight does
not operate during a Low VT3 Battery Condition
or when the VT3 is connected to a PC.
POWER SUPPLY
The VT3 utilizes one 3 volt CR2450 Lithium Battery. The Battery
should operate normally for 1 year or 300 dive hours if 2 dives
are conducted during each dive period. The VT3 checks its
battery voltage every 2 minutes during surface operation.
 If voltage of the VT3 decreases to the Warning level (2.75
volts), the Battery icon will appear on Surface display
screens (Fig. 2a) as an indication that the Battery should be
changed prior to commencing a series of dives.
 If the VT3's voltage decreases to the Alarm level (2.50
volts), the Battery icon will flash and the VT3 will shut Off.
 Low Battery Warning/Alarm conditions are not displayed
during Dive Modes.
 If a Low Battery Condition was not displayed prior to
starting a Dive, and a Low Battery Condition occurs during
the dive, there will be sufficient Battery power remaining to
maintain operation for the remainder of that dive.
Fig. 3 - L w Battery Alarm
Fig. 2 - L w Battery Warning
a

16
Transmitters use one 3 volt, CR2 Lithium Battery. A Transmitter's
battery should provide normal operation for 1 year or 300 dive
hours. Transmitters check battery voltage when they are pressur-
ized and will send a Low Battery signal to the Receiver in the
VT3 when the voltage drops below the Warning level.
 Transmitter Low Battery Warning/Alarm conditions are only
displayed on Status screens that can be accessed while
viewing the NORM Surface Display.
To check the condition of the VT3 or a Transmitter's Battery if
NORM or GAUG Mode is selected, depress the S button for 2
seconds while viewing the NORM or GAUG Surface Main
Display, then release it.
 As the button is depressed, the VT3's Receiver will activate.
 2 seconds later, the VT3's Battery status will be displayed
for 3 seconds (Fig. 4), then -
 if active and linked, Transmitter 1's Battery status will be
displayed for 3 seconds (Fig. 5), then -
 if active and linked, Transmitter 2's Battery status will be
displayed for 3 seconds, then -
 if active and linked, Transmitter 3's Battery status will be
displayed for 3 seconds, then -
 the display will then revert to Surface Mode.
 If a Transmitter is not active and linked, the message
NotAvAil (not available) will be displayed (Fig. 6).
Fig. 4 - Battery Status (G d)
Fig. 5 - Transmitter 1 Battery
Status (G d)
Fig. 6 - Transmitter 3 Status
(N t Available)

17
BAR GRAPHS
The VT3 features a Tissue Loading Bar Graph (TLBG) (Fig. 7a) that represents your relative
no decompression or decompression status.
As your Depth and Elapsed Dive Time increase, segments will add to the TLBG, and as you
ascend to shallower depths, the segments of the TLBG will begin to recede, indicating that
additional no decompression time is allowed.
The TLBG monitors 12 different nitrogen compartments simultaneously and displays the one
that is in control of your dive. It consists of 8 segments, the lower 7 represent No Decom-
pression status and the 8th at the top indicates a Decompression condition.
When the VT3 is set to operate in NORM Nitrox mode, the 5 segment O2 Bar Graph
(O2BG) (Fig. 7b) will represent oxygen accumulation.
Displays associated with oxygen and the O2 Bar Graph will be
displayed if FO2 for any Gas (1, 2, or 3) has been set at a
value other than 'Air' (e.g., a numerical value).
The O2BG will show the maximum of either per dive accumu-
lated oxygen or 24 hour period accumulated oxygen. As your
oxygen exposure (accumulation) increases during a NORM
dive, segments will add to the O2BG, and as saturation de-
creases, it will begin to recede, indicating that additional expo-
sure is allowed for that dive and 24 hour period.
Fig. 7 - TLBG and O2BG
b
a

18
The VT3 will store oxygen accumulation calculations for up to 10
dives conducted during a 24 hour period. If the maximum limit
for NORM dive oxygen loading has been exceeded for that day
(24 hour period), all of the segments of the O2BG will be
displayed flashing.
Depth/Time values will not appear in Plan Mode until the O2BG
recedes into the normal zone (lower 4 segments) indicating that
your daily oxygen dosage has decreased an amount equivalent
to the amount accumulated during the latest dive completed.
The VT3 also features a 5 segment NORM/GAUG Mode
Variable Ascent Rate Indicator (VARI) (Fig. 8a) that provides a
visual representation of ascent speed (i.e., an ascent speedom-
eter). The segments of the VARI represent two sets of speeds
which change at a reference depth of 60 feet (18 meters). Refer
to the chart for segment values.
WARNING: At depths greater than 60 feet (18
meters), ascent rates should not exceed 60 feet
per minute (18 meters per minute). At depths of
60 feet (18 meters) and shallower, ascent rates
should not exceed 30 feet per minute (9 meters
per minute).
Fig. 8 - VARI
a
VARI
Deeper than 60 FT (18 M)
Segments Ascent Rate =
Displayed FPM MPM
0 0-20 0-6
1 21-30 6.1-9
2 31-40 9.1-12
3 41- 0 12.1-1
4 1-60 1 .1-18
60 + 18 +
60 FT (18 M) & Shallower
Segments Ascent Rate =
Displayed FPM MPM
0 0-10 0-3
1 11-1 3.1-4.
2 16-20 4.6-6
3 21-2 6.1-7.
4 26-30 7.6-9
30 + 9 +

19
PC INTERFACE
Interface with a PC is accomplished by connecting the VT3 to a PC USB Port using the USB
Interface Cable provided. The same Cable is used for Upload and Download.
The software program is on the OceanLog CD provided, together with a USB Driver. The
program's Help section serves as the User Manual and can be printed for personal use.
The Settings Upload program is used to check the VT3's existing Settings and for entering
settings into the VT3. The Data Download program is used to retrieve Data that was
sampled during dives and stored in the VT3's memory.
The VT3 checks for an External Access request once every second while in Surface Mode.
Checks are not made if the unit is WET. For a connection to be made, the Interface Cable
is plugged into the VT3's Data Port and plugged into a PC USB Port. To establish the
connection, the PC program must be running asking 'RUTHERE'. When the connection is
made, all segments of the VT3 appear on the display until completion of the Upload or
Download operation.
 The VT3 reverts to the Surface Mode Main screen after completion of the Upload or
Download operation, or after 2 minutes if no PC action was taken.
SYMBOLS AND ALPHA NUMERIC GRAPHICS
The upper line of digits on the LCD screen is used to convey alpha Messages such as Day
of the Week, Operating Modes, items being Set, Gas and Transmitter identification,
Altitude level, and Alarm identification. At times, the second line is also used to display
alpha numeric graphics such as PO2 and On/Off. The FO2 setting of a selected Gas will
appear in the lower line.

20
ALPHA / NUMERIC DISPLAYS
Tank Pressure Display (NORM/GAUG only)
When the VT3's Receiver is set ON and active, Tank Pressure
from an active Transmitter that is properly linked will be dis-
played on the NORM or GAUG MAIN screens (Fig. 9a).
Values of Pressure are displayed numerically from 000 PSI (00
BAR) up to 5,000 PSI (345 BAR) in increments of 5 PSI (1 BAR).
Depth Displays (all Modes)
During dives, the Current Depth display (Fig. 9b) and Maxi-
mum Depth which is accessed as an Alternate Display (Fig.
10a) indicate Depths from 0 to 399 FT (120 M) in increments of
1 FT (.1 M).
During a No Decompression Safety Stop, the set Stop Depth
(Fig. 11a) is displayed and during a Decompression condition,
the required Ceiling Stop Depth is displayed. These Depths
are graphically on the top row of the screen with the letters F
indicating Feet and M indicating Meters. (ex: 10F = 10 FT Stop)
Air Time Remaining (ATR) Display
If the VT3's Receiver and a Transmitter are active and properly
linked, ATR is displayed digitally in decrements of 10 minutes
when it is 60 minutes or less (Fig. 11b).
Fig. 11 - Safety St p Display
a
Fig. 9 - Main Dive Display
b
a
Fig. 10 - ALT Dive Display
a
b