IST GP-4000 User manual

WWW.ISTSPORTS.COM
DIVE COMPUTER
GP-4000
COMPASS +

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GP-4000 COMPASS +
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- CONTENT -
I. GENERAL OVERVIEW ...... 3
I. 1. HARDWARE SPECIFICATIONS & MEASURABLE RANGE ...... 4
II. MODES AND FUNCTIONS ...... 5
II. 1. GENERAL INFORMATION ...... 5
II. 1. 2. OVERALL OPERATION FLOW CHART ...... 6
II. 1. 3. BUTTONS OF OPERATION ...... 8
II. 2. 1. TIME MODE ...... 9
II. 2. 2. COMPASS MODE ...... 11
II. 2. 3. DIVE SET MODE ...... 13
II. 2. 4. DIVE PLAN MODE ...... 17
II. 2. 5. DIVE LOG MODE ...... 18
II. 2. 6. PROFILE MODE ...... 21
II. 2. 7. HISTORY MODE ...... 22
II. 2. 8. PC TRANSFER MODE ...... 24
II. 2. 9. TIME SET MODE ...... 25
II. 2. 10. DIVE MODE / GAGE MODE ...... 26
III. IMPORTANT NOTICES ...... 35
III. 1. BATTERY ...... 35
III. 2. DIVING ...... 35
IV. MAINTENANCE AND STORAGE ...... 36
V. TROUBLE SHOOTING ...... 37
VI. WARRANTY ...... 39
VII. PURCHASE RECORD ...... 39

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Congratulations on choosing IST COMPASS+ dive computer. This important diving
equipment has been designed, manufactured and tested to the highest standard to
ensure its safety and proper operation in all normal recreational diving situations.
This product was built based on our successful GP-3000 DATA+ dive computer but
has more functions added and an improved data output so all information needed by
a diver is readily accessible. Please take a little time to read and fully understand all
information provided within these pages so you can use this unit safely and benefit
from all of its functions.
Happy diving!
I. GENERAL OVERVIEW
GP-4000 COMPASS+ is an advance wrist-top dive computer that not only provides
all essential dive information such as dive time, temperature, depth etc. to a diver in
an easy-to-understand format, it also has a built-in electronic compass (can be reset
to suit navigational needs in different parts of the world) and 3 NITROX settings to
give convenience and to accommodate different divers’ needs. All data collected can
be retrieved and saved in your personal computer by using IST PCI-3000 downloader
(available separately) and GP-4000 COMPASS+ software (available from www.
istsports.com). Other functions such as dive plan, warning alarms, dive safety level
etc. can also be programmed to suit a particular dive mission.
PLEASE NOTE:
COMPASS+ performs decompression diving calculations by using algorithms
based on Swiss-model theory and research developed by Mr. C. Randy Bohrer.
It is intended for use by individuals who have completed a recognized scuba
diving course.
People who are not aware of the risks of scuba diving, and / or have not been
properly trained and certified should not use this unit.
The decompression algorithm used in COMPASS+ is designed with the
assumption that no-decompression diving will be carried out. It does provide
decompression diving data just in case, but this is dangerous and should be
avoided.
This dive computer’s standard settings assume the user is of average
physical strength and in general good health. The diver should therefore dive
responsibly and make a safe diving plan suited to him or herself.
You can use this dive computer for Nitrox diving but requires user input with
regards to the gas mixture in the scuba cylinder.

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GP-4000 COMPASS +
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COMPASS+ is strictly meant for recreational diving use; do not use it for any
other underwater activities
However, individuals who do not understand or have not taken proper
training in NITORX diving should not use the dive computer for NITROX
diving. Also, it is extremely dangerous to enter incorrect NITROX information
into the dive computer to the actual gas being used. Always reset each time
you dive and have your dive buddy to double-check the setting, never dive
with incorrect settings.
This dive computer is designed with the assumption that only one individual
alone will use it. If the unit is lent to another person, be sure to clear all
records so only new data can be collected for calculation (i.e. Desaturation
time, PGT indicator and OLI indicator should be 0). The unit should never be
lent to someone else when repeated dives are planned.
I. 1. HARDWARE SPECIFICATIONS & MEASURABLE RANGE
Dimension & weight: Case thickness: 28mm (1.1”)
Case diameter: 62mm (2.4”)
Total length (incl. straps): 328mm (12.9”)
Wight: 115g (4oz.)
Battery: CR2032 lithium button battery.
Battery life: From new battery, approximately 1.5 years in time mode.
Maximum waterproof / operation depth: 99m (328ft)
PC Connectable: Yes (PCI-3000 downloader is available separately)
Accuracy: Average monthly time variance: ± up to 30 seconds
Depth: ± up to 3% + 0.5m (±1% + 2ft)
Temperature: up to ±2.0°C (±4°F)
Measurement range:
Depth: 0.0m - 99.9m (0.0ft - 328ft). Measurement taken every second.
Total dive time: 0 - 599 minutes (DIVE mode).
0 - 1199 minutes (GAGE mode).
Altitude: 0m - 6000m (0ft - 19680ft). Measurement taken every 10 minute (but
not when in DIVE mode or PC TRANSFER mode).
Temperature: -5°C - 40°C (23°F - 104°F). Measurement taken every second
(DIVE mode only)
NITROX (FO2)setting: 21% - 99% in 1% increment.
Operating temperature range: -5°C - 40°C (23°F - 104°F)
NOTE: In cold environment, the display may be somewhat dimmer.
Storage temperature: 0°C - 50°C / 32°F - 122°F

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II. MODES AND FUNCTIONS
II. 1. GENERAL INFORMATION
COMPASS+ is a mobile dive computer intended for scuba diving. It collects and
records depth change, altitude at the point of entry, dive time and water temperature
and based on the information measured, it automatically calculates and displays
critical information such as oxygen & nitrogen exposure levels, No Decompression
Limit time etc. in an easy to read format with EL back light illumination. The
following modes (in the order as listed) are contained within the unit and all of the
funtions will be explained in detail later in this chapter.
NON-DIVE modes
Time mode: Watch and full-auto calendar function (with auto leap year
recognition and auto month-end recognition).
Compass mode: In azimuth and numerial angle display.
Dive Set mode: Variables such as FO2settings (up to 3 Mixes), PO2, depth
/ time alarms etc. can be defined here.
Dive Plan mode: Planned dive time and maximum depth can be set here.
Dive Log mode: Saves and displays up to 60 dives' information.
Dive Profile mode: Displays depth changes of a logged dive pictorially.
History mode: Displays the total numbers of dives and total dive time.
PC Transfer mode: To retrieve or upload information from a PC which has a
compatible software installed (avail. from IST web site).
Time Set mode: Set current time and date
DIVE specifice modes
DIVE mode: COMPASS+ will automatically enter this mode when the water
dectection sensor is activated and the depth is more than 1.2m
/ 4ft. In this mode, the computer will inform you all the
important dive information and give out warnings to help you
dive safely.
GAGE mode: If this mode was chosen before a dive has begun, the unit will
give out information much like a conventional dive instrument.

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GP-4000 COMPASS +
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II. 1. 2. OVERALL OPERATION FLOW CHART
AM
DIVE
N2O2
TEMP
25.8 C
AM
DIVE
N2O2
USERTEXT
AM
DIVE
N2O2
TEMP
25.8 C
DESAT SURF.T
DIVE
N2O2
O
A
N
DIVE
N2O2
ROTATE
SLO
W
LY
O2
PLAN
N2
DIVE
m
NDL
min
DECO PO2SLOW
PM
DIVE
N2O2
NO
P.
LOG
FO2
DECO PO2SLOW
PM
DIVE
N2O2
P.
2
min
DIVE.T
DECO PO2SLOW
DIVE
N2O2
P.
3
MAX
m
m
AVE
C
DIVE
m
min
N2O2
NO DIVE.T
P.
TIME MODE
A or C button : EL back light comes on for 4 sceconds
< After Dive >
COMPASS MODE
A or C button : EL back light comes on for 4 sceconds
MAX
DIVE
m
N2O2
FO2
P.O2
DIVESET
N2O2
DIVEMODE
DIVE
DIVE
MAX
DIVE
m
N2O2
P.O2
1 AI R
N2O2
DEPTH
A L A R M
DIVE
m
N2O2
DIVETIME
A L A R M
DIVE
min
DIVE.T
N2O2
DEEPSTOP
ON
DIVE N2O2
WATER IS
SEA
DIVE O2
PROFILE
TIME
DIVE
N2O2
USER
SAFETY
DIVE
N2
press A
Hold C button
B key
< DECLINATION >A key Long:Set Orientation
B key
DIVE SET MODE
A button
< Display 1 >
B key
< Display 2 > < Display 3 > < Display 4 > < Display 5 >
< Display 6 > < Display 7 > < Display 8 > < Display 9 >
PLAN MODE
A : UP
C : DOWN
B key 3 seconds : TIME MODE
LCD OFF : When there is no key input for 4~5minutes( No desat time,bar display)
When there is no key input for 9~10minutes( desat time,bar display)
DIVE LOG MODE
B key
< Page 1 > < Page 2 > < Page 3 >
A : Log Number UP
C : Log Number DOWN
DIVE PROFILE MODE
A : LogNumber UP
C : LogNumber DOWN
B key

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Note: when the unit does not detect any input, it will automatically enter battery
saving mode (no information displayed).
DIVE
m
N2O2
NO
HISTORY
N2O2N2O2
LINKED
N2O2
TIMESET
AM
DIVE N2O2
TIME
FORMAT
DIVE
N2O2
NITROX
WATER
AM
SAFE
m
min
N2O2
DIVE.T
SLOW
DIVE
min
NITROX
NDL
P.O2
SLO W
SAFE
STOP
DIVE
m
min mi n
N2O2
NITROX
NDL
SAFE
2’4 7
DIVE.T
P.O2
SAFEDEEP
STOP
DIVE
m
m min
N2O2
NITROX
DEEP
2 6M’5 6
P.O2
min
TOTAL
DECO
DIVE
m minmin
N2O2
NITROX
P.O2
SAFE
m
TOTAL
DECO
STOP
SAFE
DIVE
N2O2
AM
NITROX %
FO2FO2
SAFE
DIVE
m
min
N2O2
NITROX
DIVE.T
MAX
C
SAFE
DIVE
m
min mi n
N2O2
NITROX
NDL DIVE.T
P.O2
SAFE
m
min
N2O2
DIVE.T
GAGE
min
O2
NITROX
DIVE.T
SAFE
O
N
DIVE
SAFE
DIVE
m
min
N2O2
NITROX
NDL DIVE.T
P.O2
1 32
%
HISTORY MODE B button
PO TRNAS MODE
B button
< Wait Link > < Link >
TIME SET MODE
B button
< Display 1 > < Display 2 >
A : Select
C : Set
DIVE MODE A or C button: EL back light comes on for 4 sceconds
Water Detection
> 1.2m
< Water Detection >
All Key is Locked
< DEMAND A >
2 seconds
< DEMAND B >
< No DECO >
< GAGE >
< Mix Change >
< DECO >
A : Set Orientation
B: Display Select
DiveTime or Depth
< Dive Compass >
A : Select
DEMAND MODE WARNING
DIVE MODE (Mix Change)
< Acsentrate Warning >
< SAFETY STOP > < DEEP STOP >
Warning
A: alternative display
Hold C : BookMark
Hold B
button
C button

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II. 1. 3. BUTTONS OF OPERATION
Button
A
B
C
Water sensor
Set button
Moves to the next mode
To change to the next variable
Main function
1) Once activated, the dive computer automatically enters
DIVE mode when depth is more than 1.2 m
2) Serve as contact points for PCI-3000 downloader to
retrieve log and history information from the unit
RESET The RESET button is located on the under side of the unit.
Please reset COMPASS+ immediately after battery change.
A
B
C
WATER
SENSOR

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This is the first mode displayed when the unit first comes on (when any button is
pushed). Here are examples of what the screen would look like in different situations:
II. 2. 1. TIME MODE
AM
DIVE
N2O2
TEMP
25.8 C
1) Current air temperature
2) Current day of the week
3) Current time (can be in either 12h or 24h
clock mode)
4) Current date
5) DIVE icon (or GAGE icon): The mode
the computer will enter once
activated.
[ Normal display ]
[ Display after a dive - DIVE]
1) Don't fly icon
2) PGT indicator
3) NITROX indicator
4) DESAT count-down timer
5) Surface timer
6) OLI indicator
(1)
(3)
(2)
(5)
(4)
(1)
(3)
(2)
(4)
[ Display after a dive - GAGE]
(1)
(2)
AM
DIVE
N2O2
TEMP
25.8 C
DESAT SURF.T
NITROX
(6)
AM
N2O2
TEMP
25.8 C
DESAT SURF.T
GAGE
1) Battery indicator
2) Altitude indicator

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Altitude icon
No icon
1500m - 2600m (4920ft - 8528ft)
600m - 1800m (1968ft - 5904ft)
0m - 900m (0ft - 2952ft)
Range representation
2300m - 6000m (7544ft - 19680ft)
Error (icon blinks) + 6000m (+ 19680ft)
Icon explainations:
Battery indicator icon (if shown): It will appear in all modes (except PC Transfer
mode) when the battery is on low power (voltage less than 2.7V). You can not go to
DIVE mode while the battery indicator icon is ON. Be sure to replace the battery
when this icon appears.
Altitude icon (if shown): The computer automatically measures the location's
altitude and display accordingly.
NITROX icon: This icon is on if FO2 value is entered (in Dive Set mode). If no
value is entered, then this icon flashes.
PGT (Pressure Gas in Tissue) indicator (if shown): This indicates the level of
Nitrogen accumulated in the body by a nine-level bar graph (DIVE mode only).
OLI (Oxygen Limited Indicator) indicator (if shown): This indicates the level of
Oxygen accumulated by a eight-level bar graph (DIVE mode only).
DIVE / GAGE mode icon: The selected mode is shown.
Surface timer (if shown): This icon comes on when a dive is deemed completed .
A dive is counted when being submerged for more than 3 minutes and a depth
greater than 1.2m / 4ft has been reached. If a descent is detected by the computer
within 10 minutes of surface time, the previous dive will continue. Surface time is
continued for a maximum of 48 hours.
Desaturation count-down timer (if shown): This indicates the time remaining
until nitrogen dissipates from the body. (DIVE mode only).
Don’t Fly icon (if shown): It appears while desaturation time is being counted. If
desaturation time is less than 12 hours, this icon will disappear after 12 hours
(DIVE mode). If in GAGE mode, this icon will disappear after 48 hours.

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--- NOTE ---
Even when there is no PGT (=pressure gas in tissue) level indicated, a change in
altitude will cause PGT graph to be displayed and desaturation time counted.
When the PGT graph is high (on 7 or 8 levels), a change in altitude may cause
the maximum nine-level graph to appear. To prevent this, never use the dive
computer when extreme high-altitude icon is displayed. Should this happen,
DIVE mode will be disabled as a safety precaution. Normal function will be
restored when PGT level drops to 8 or below.
The PGT graph and desaturation count-down timer may not be turned off at the
same time (up to one minute difference).
Buttons of operation
Button
A
EL back light is on for 4 seconds
Move to Compass mode
EL back light on for 4 seconds
Function in Time mode
B
C
Move into DIVE / GAGE mode
Water sensor
When entering this mode, the digital azimuth compass will appear. Azimuth is
displayed in the dot-matrix section of the screen. If there is a orientational need
to mark the a heading at any time, simply hold the A button for 2 seconds (see the
following pictures). To cancel the mark, press the A button for 2 seconds.
II. 2. 2. COMPASS MODE
[ Display after a dive - GAGE]
1) Azimuth display
2) Numerical angle display
3) Current time
[ Normal Compass mode display]
(3)
(1)
(2)
DIVE
N2O2
O
A
N

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GP-4000 COMPASS +
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[ Hold A button for 2 seconds to mark (or to cancel) ]
DIVE
N2O2
O
A
N
1) Initial heading marked
(1)
Before using the compass for its very first dive, please reset the azimuth
delineation as your locatiion's latitude may be significantly different to factory
setting and the reading can be inaccurate. Also, many divers are also travellers,
remember to reset the compass delineation when the new diving location has a
significant change in latitude to the previous dive.
DIVE
N2O2
ROTATE
SLO
W
LY To realign the compass to earth’s axis,
press the C button for 2 seconds, hold
COMPASS + parallel to the ground then
rotate the unit very slowly clockwise until
a full circle is indicated by the dot-matrix
display. Press C for 2 further seconds to
exit the function.
Buttons of operation
Button
A
EL back light is on for 4 seconds
Reset azimuth delineation (hold button for 2 seconds)
Move to Dive Set mode
EL back light on for 4 seconds
Mark initial orientation (hold button for 2 seconds)
Function in Compass mode
B
C
Move to Time mode (after 2 minutes)
No input
Move into DIVE / GAGE mode
Water sensor
--- NOTE ---
If in this mode, the unit:
1) has taken a measurement outside the working range, or
2) is locked in decompression stop violation,
all display segments will flash and can not enter DIVE / GAGE mode.

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In this mode, you are able to define the following variables after selecting which mode
(DIVE or GAGE) to use once the water sensor is activated in dive condition:
II. 2. 3. DIVE SET MODE
1) PO2setting (from 1.0 - 1.6)
2) PO2 max. depth will automatically
be adjusted)
3) FO2setting (up to 3 mixes; Mix 1
has AIR as default and when a
value other than 21% (up to 99%)
is used, the NITROX icon will
appear)
DIVE mode
(in the same order as the computer):
MAX
DIVE
m
N2O2
FO2
P.O2
DIVESET
O2
DIVEMODE
GAGE
GAGE
N2
GAGE mode
(in the same order as the computer):
N2O2
DIVEMODE
DIVE
DIVE
(2)
(2)
(3)
(1)
(1)
MAX
DIVE
m
N2O2
P.O2
1 AI R
O2
DEPTH
A L A R M
GAGE
N2
m
1) Max. depth setting (2m - 99m /
6ft - 325ft)
2) Max. depth alarm (on / off)

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GP-4000 COMPASS +
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(1)
(2)
1) Max. depth setting (2m - 99m /
6ft - 325ft)
2) Max depth alarm (on / off)
N2O2
DEPTH
A L A R M
DIVE
m
N2O2
DIVETIME
A L A R M
DIVE
min
DIVE.T
1) Max. dive time setting (1 - 599
minutes)
2) Max dive time alarm (on / off)
(1)
(2)
N2O2
DEEPSTOP
ON
DIVE
1) Deep Stop (on / off)
(1)
O2
DIVETIME
A L A R M
GAGE
N2
min (1)
(2)
1) Max. dive time setting (1 - 1199
minutes)
2) Max dive time alarm (on / off)
O2
WATER IS
SEA
GAGE
N2
1) SEA / FRESH water setting
(1)
O2
PROFILE
TIME
N2
GAGE
1) Profile Time (dive data collectd
can
be recorded at the end of every
10th or 30th second.
(1)
END OF THE GAGE MODE CYCLE.
& RETURNS TO THE BEGINNING
OF THE MODE.

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N2O2
WATER IS
SEA
DIVE
1) SEA / FRESH water setting
(1)
O2
PROFILE
TIME
DIVE
N2
1) Profile Time (dive data collectd
can be recorded at the end of
every 10th or 30th second.
(1)
1) User Safety Factor - level 0, 1 or 2.
When 0 is selected, the algorithm
for the current altitude is used
while 1 means algorithm for the
next higher altitude is used and 2
means algorithm of 2 higher
altitude level is used.
O2
USER
SAFETY
DIVE
N2
END OF THE DIVE MODE CYCLE
& RETURNS TO THE BEGINNING
OF THE MODE.

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GP-4000 COMPASS +
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--- NOTE ---
The Dive Set mode can not be accessed if the unit:
1) is within 10 minutes of a just-completed dive (either in DIVE or
GAGE mode), or
2) is locked in decompression stop violation, or
3) has an out of range measurement.
All input values will return to the default setting after 13 hours of the last
completed dive.
Always check the FO2% setting before a dive.
After using GAGE mode for diving, the DIVE mode can not be chosen for 48
hours.
Buttons of operation
Button
A
Adjust the variable
Move to Dive Plan mode
Move to the next variable
Function in Dive Set mode
B
C
Move to Time mode (after 2 minutes)
No input
Move into DIVE / GAGE mode
Water sensor
To change measurement units: m / °C ↔ ft / °F
A + C

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Use this mode to set the actual planned diving depth so COMPASS+ can work out the
most appropriate No Decompression time Limit (NDL). The range is from 9m (30ft) -
48m (160ft) in 3m (10ft) increment.
II. 2. 4. DIVE PLAN MODE
O2
PLAN
N2
DIVE
m
NDL
min
--- NOTE ---
The Dive Plan mode can not be accessed if the unit:
1) is locked in decompression stop violation, or
2) has a measurements that is out of range.
If maximum planned dive depth setting exceeds the PO2 value setting, the time
display will show "- - -". Check if the PO2 value setting needs to be adjusted (in
DIVE SET mode) and also consider revising the existing dive plan in order to dive
safely.
Buttons of operation
Button
A
Move the depth setting down - 3m (10ft) per click
To fast-track down (hold C button)
Move to Dive Log mode
Move the depth setting up - 3m (10ft) per click
To fast-track up (hold A button)
Function in Dive Set mode
B
C
Move to Time mode (after 2 minutes)
No input
Move into DIVE / GAGE mode
Water sensor

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GP-4000 COMPASS +
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In this mode, the data of completed dives are displayed (a dive is when a diver is
submerged underwater for more than 3 minutes to a depth greater than 1.2m (4ft).
COMPASS + can hold up to 60 dive records (the dive profile's sampling time is set
at 30 second interval) (DIVE records + GAGE records = 60dives). Each record has 3
pages of log information.
Once the memory is full, the oldest data is deleted to allow room for the latest
information.
Depth profile (shown in the dot-matrix display): Each time the curser moves
represents a time interval of 30 seconds
The maximum dive time for each dive is 59 minutes.
II. 2. 5. DIVE LOG MODE
DECO PO2SLOW
PM
DIVE
N2O2
NO
P.
LOG
1) Pictorial depth profile
2) Number of dive as at date shown
3) Dive entry time
4) Dive date
5) Log number
6) Log page icon (1st page)
(4)
(1)
(3)
(2)
(5)
(6)
[ Dive Log mode display (DIVE mode) - 1st page ]
[ Dive Log mode display (DIVE mode) - 2nd page ]
1) Dive end time
2) FO2information
3) Total dive time
4) Log page icon (2nd page)
FO2
DECO PO2SLOW
PM
DIVE
N2O2
P.
2
min
DIVE.T
(3)
(1)
(2)
(4)

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[ Dive Log mode display (DIVE mode) - 3rd page ]
1) Maximum depth
2) Lowest temperature measured
3) Average depth
4) Log page icon (3rd page)
(3)
(1)
(2)
(4)
DECO PO2SLOW
DIVE
N2O2
P.
3
MAX
m
m
AVE
C
[ Dive Log mode display (GAGE mode) - 1st page ]
[ Dive Log mode display (GAGE mode) - 2nd page ]
DECO PO2SLOW
PM
N2O2
NO
P.
LOG
GAGE
DECO PO2SLOW
PM
N2O2
P.
2
min
DIVE.T
GAGE

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GP-4000 COMPASS +
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[ Dive Log mode display (GAGE mode) - 3rd page ]
DECO PO2SLOW
N2O2
P.
3
MAX
m
m
AVE
GAGE
C
[ Dive Log mode display - when no dive data ]
N2O2
DIVE
[ Dive Log mode display - warnings recorded ]
1) SLOW icon: when ascent
is too fast (blinking)
2) PO2warning (blinking)
3) Decompression dive (if warning,
then the icon blinks)
4) OLI warning (maximum level: 8)
5) Out of range - the whole screen
blinks
(4)
(1)
(3) (2)
(5)
DECO PO2SLOW
PM
DIVE
N2O2
NO
P.
LOG
Warnings may be generated and recorded during a dive. For further information,
please see the DIVE mode section.