Sherwood Scuba Insight User manual

2
RESPONSIBLE COMPUTER DIVING
Since the advent of dive computers, it is a common mistake to assume that the old traditional rules of diving no longer apply,
but the truth is just the opposite. Before you dive using your Insight, keep these basic rules in mind:
 Plan each dive, and dive your plan - Your Insight was not designed to make decisions for you, only to provide you
with the information you need to make responsible decisions for yourself. This begins with a dive plan that will
help you avoid a low air or decompression situation.
 Do not plan any dive that e ceeds your training or e perience level.
 Inspect your computer before every dive - If it shows any signs of damage or abnormal function, D N T dive with
it until it has received factory service.
 Make your deepest dive first - When making repetitive dives, it is imperative to ensure that each consecutive dive is
shallower than the one before. This will allow your body's slower tissues to continue outgassing nitrogen.
 Make the deepest part of your dive first, and gradually work your way to the surface using a staircase profile - The abil-
ity to perform multilevel diving is one of the most important contributions of a dive computer, and you should
take advantage of it. It will increase your bottom time and at the same time decrease your risk of decompression
sickness.
 Ascend slowly by following an ascent line whenever possible, or by ascending diagonally toward the surface - Watch
the Ascent Rate Indicator closely while you ascend, and keep it in the green zone as much as possible.
 A Safety Stop of 3 minutes or more is recognized as a prudent action to reduce the probability of bubble forma-
tion in divers.
Responsible
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Insight
The following symbols are used throughout this manual to bring your attention to situations that require special consid-
eration. Be sure to read and follow all instructions carefully.
A N TE is used to emphasize an important maintenance technique.
A CAUTI N is used before a maintenance technique that will result in damage to parts if that tech-
nique is not followed carefully.
A WARNING is used before a procedure that will result in serious injury or death if the procedure
is not followed carefully.
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WARNINGS:
 The Insight is intended for use by recreational divers who have successfully completed a nationally
recognized course in scuba diving, and diving with enriched nitrogen-oxygen (nitrox) breathing gas
mixtures
 It is intended only for no decompression diving, NOT intentional decompression diving
 It must not be used by untrained persons who may not have knowledge of the potential risks and haz-
ards of scuba diving, and diving with enriched nitrogen-oxygen (nitrox) mixtures
 You must obtain scuba certification, and certification in diving with enriched nitrogen-oxygen mixtures
(nitrox) before using the Insight if you have not already done so
 It is NOT for use by military and commercial divers
 It should NOT be utilized for any competitive, or repetitive square wave or decompression diving, as it
is intended solely for recreational use and no decompression multilevel diving
 As with all underwater life support equipment, improper use or misuse of this product can cause seri-
ous injury or death
 Conduct your dives in such a manner so as to insure that you continuously check the computer's
proper function
 Read and understand this owners manual completely before diving with the Insight
 If you do not fully understand how to use this dive computer, or if you have any questions, you should
seek instruction in its use from your authorized Sherwood dealer before you utilize this product
 Never participate in sharing or swapping of a dive computer Doing so may result in injury or death
The Insight provides information based upon a divers personal dive profile, and therefore must not be
shared between divers You should never, under any circumstances, swap your computer with an-
other unit between dives, or share your computer with another diver underwater

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Insight
LIMITED TWO-YEAR WARRANTY
Sherwood Scuba guarantees, to the original purchaser only, that the Insight will be free of defects in materials and/or craftsmanship under normal recreational
multilevel scuba use for two years from date of purchase, provided proper care and annual service are performed as described within this dive computer manual.
Should your Insight prove to be defective for any reason (other than those listed in the limitations section below) it will be repaired or replaced (at Sherwood
Scuba's discretion) free of charge excluding shipping and handling charges.
his warranty will be considered void if the registration card is not filled out completely at the time of purchase and mailed to Sherwood Scuba within 30 days
of purchase, and/or if the annual inspection is not done according to this dive computer manual. his warranty is non-transferrable and applies to the original
purchaser only. All correspondence concerning this warranty must be accompanied by a copy of the original sales receipt and a copy of the owners portion of
the warranty registration card including the annual inspection record.
Once each year you must return the Insight to an Authorized Sherwood Dealer within 30 days of the original purchase date anniversary to keep the
two year limited warranty in force. Annual inspection includes verification of depth accuracy and proper general function. Labor charges for the annual in-
spection are not covered by the warranty. You must provide a copy of the original sales receipt and a copy of the owners portion of the warranty registration
card including the annual service record to obtain warranty service.
Statement of imitations - General:
Warranty does not cover damage from accident, abuse, battery leakage, tampering, lack of proper care and maintenance and/or proper annual servic-
ing, or improper use of the Insight. Modifications or repair by anyone other than a Sherwood Sales and Service Center authorized to service the Insight will
void the warranty. Sherwood Scuba will not be responsible for recovery or replacement of the product in the event of loss or theft. Sherwood Scuba, its dis-
tributors, and retailers make no warranties, either expressed or implied, with respect to this product or its owners manual except those stated in the preceding
paragraphs. In consideration of the sale of the Insight to you, you agree and understand that in no event will Sherwood Scuba, its distributors or retail-
ers, be held liable for any personal injuries resulting from its operation, or for any other damages whether direct, indirect, incidental, or consequential
even if Sherwood Scuba is advised of such damages.
Some states do not allow the exclusion or limitation of implied warranties or liabilities for incidental or consequential damages, so the above limitation may not
apply to you.
Warranty does not extend to plastic gauge face, o-rings, batteries, or damage due to accident, abuse, modification, or tampering.

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COPYRIGHT NOTICE
his dive computer 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 Sherwood Scuba LLC / 2002 Design.
Insight Dive Computer Manual, Doc. No. 12-2704
© 2002 Design, 2005
TRADEMARK NOTICE
Sherwood Scuba, the Sherwood Scuba logo, and HydroGlo are registered trademarks of Sherwood Scuba LLC, Insight and the Insight logo are also trade-
marks of Sherwood Scuba LLC. All rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Data Sensing and Processing Device (U.S. Patent no. 4,882,678), Dive ime Remaining (U.S. Patent no. 4,586,136), and Ascent Rate Indicator (U.S. Patent
no. 5,156,055).
DECOMPRESSION MODEL
he programs within the Insight simulate the absorption of nitrogen into the body by using a mathematical model. his model is merely a way to apply a lim-
ited set of data to a large range of experiences. he Insight dive computer model is based upon the latest research and experiments in decompression theory.
Still, using the Insight, 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-
file.

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Insight
CONTENTS
FEATURES and DISPLAYS ......................................................................................................................... 11
Introduction ................................................................................................................................................... 12
Control Buttons ............................................................................................................................................. 13
Intuitive Displays ........................................................................................................................................... 14
Bar Graphs ............................................................................................................................................... 15
Ascent Rate Indicator............................................................................................................................ 15
Nitro en Bar Graph ............................................................................................................................... 16
Depth Displays .......................................................................................................................................... 17
Date Display ............................................................................................................................................. 17
Time Displays ........................................................................................................................................... 18
Temperature Display ................................................................................................................................. 19
Backli ht Feature .......................................................................................................................................... 19
Operatin Temperature ................................................................................................................................. 19
Audible Alarm ................................................................................................................................................ 20
ACTIVATION and SETUP ...........................................................................................................................21
Push Button Activation .................................................................................................................................. 22
Water Contact Activation .............................................................................................................................. 23
Surface Mode ............................................................................................................................................... 24
Enterin Settin s .......................................................................................................................................... 24
To Set FO2 (50%) Default ......................................................................................................................... 25
To Set Units of Measure ........................................................................................................................... 26
To Set Date/Time ...................................................................................................................................... 26
To Set Dive Profile Data Samplin Rate ................................................................................................... 28
To Set Alarms ............................................................................................................................................ 28
To Set Wet Activation ................................................................................................................................ 29
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CONTENTS (CONTINUED)
Reset (Clear) ................................................................................................................................................ 30
PRE DIVE and DIVE MODES ...................................................................................................................... 1
Pre Dive Modes ............................................................................................................................................ 32
FO2 Mode ................................................................................................................................................. 32
FO2 Set for Use with Air .......................................................................................................................... 33
FO2 for Use with Nitrox ........................................................................................................................... 33
FO2 50% Default ON ............................................................................................................................ 33
FO2 50% Default OFF .......................................................................................................................... 34
Settin FO2 for Use with Nitrox ............................................................................................................ 34
Plan Mode ................................................................................................................................................. 35
No Decompression Dive Mode ..................................................................................................................... 36
No Decompression Dive Mode Safety Stop ............................................................................................ 38
POST DIVE MODES .................................................................................................................................... 9
Post Dive Surface Mode ............................................................................................................................... 40
Transition Period ....................................................................................................................................... 40
After the Transition Period (the First 2 Hours) .......................................................................................... 41
To view Temperature and O2SAT ......................................................................................................... 41
To access FO2 Mode ............................................................................................................................ 41
To access Plan Mode ............................................................................................................................ 42
To access Fly/Desat Mode .................................................................................................................... 42
Lo Mode .................................................................................................................................................. 43
After the First 2 Hours ............................................................................................................................... 45
External Access Mode .............................................................................................................................. 46
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CONTENTS (CONTINUED)
SPECIAL SITUATIONS ................................................................................................................................47
Emer ency Decompression ......................................................................................................................... 48
Nitro en Bar Graph ................................................................................................................................... 48
Decompression Dive Mode ...................................................................................................................... 49
Mana in Decompression Stops .............................................................................................................. 51
Violation Modes ............................................................................................................................................ 52
Conditional Violation Mode ....................................................................................................................... 52
Delayed Violation Mode ............................................................................................................................ 53
Immediate Violation Mode and Gau e Mode ........................................................................................... 55
Permanent Violation ................................................................................................................................. 56
Oxy en Exposure ......................................................................................................................................... 57
Partial Pressure of Oxy en ....................................................................................................................... 57
Hi h PO2 Dive Mode ............................................................................................................................ 57
Oxy en Accumulation ............................................................................................................................... 58
Hi h O2 Saturation ............................................................................................................................... 59
Unexpected Loss of Displayed Information .................................................................................................. 60
Special Warnin s and Additional Safety Information .................................................................................... 61
CARE, INSPECTION, and SERVICE .......................................................................................................... 6
Care and Cleanin ........................................................................................................................................ 64
Annual Inspections and Service ................................................................................................................... 65
Battery Life .................................................................................................................................................... 66
Low Battery Condition ................................................................................................................................... 66
Battery Replacement .................................................................................................................................... 67
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CONTENTS (CONTINUED)
REFERENCE ................................................................................................................................................ 7
Dive Time Remainin .................................................................................................................................... 74
Altitude Divin ............................................................................................................................................... 75
Flyin After Divin ......................................................................................................................................... 76
Nitrox Divin ................................................................................................................................................. 77
Multiple Tissue Trackin ............................................................................................................................... 78
Repetitive Decompression Divin ................................................................................................................. 79
No Decompression Limits ............................................................................................................................. 80
Specifications ................................................................................................................................................ 81
Glossary ........................................................................................................................................................ 84
Inspection / Service Record .......................................................................................................................... 86
Full LCD Display ........................................................................................................................................... 87
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Insight
FEATURES
and
DISPLAYS

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INTRODUCTION
Congratulations on your recent purchase of the Sherwood Insight !
Your Insight presents the information that you need before, during, and after your air (or nitro ) dives using an intuitive combi-
nation of easy to read displays and unique identification icons.
Tissue loading of nitrogen and ascent rate are presented as segmented bar graphs alongside color coded reference indicators
that bring quick focus to these important status displays.
As you progress through this instructional guide, you will become familiar with all of the unique functions and features avail-
able and see e amples of the displays that you could e pect to see in the various operational modes. Although it will require an
initial investment of time to become acquainted with the various icons and symbols, youll soon agree that your Insight is easy
to understand and use.
Due to the importance that you understand the Insight thoroughly prior to using it, information will be e panded upon and
some refreshed as you proceed. Rela and read through the complete owner's manual.
It is extremely important that you:
 Read this dive computer manual in sequence and understand it completely before attempting to use the Insight.
 Check the Insight frequently during your dive.
 You must also be a trained diver, certified by a recognized training agency in SCUBA diving.
 Prior to using the oxygen related features of the Insight, you must also be trained and certified for diving with en-
riched nitrogen-oxygen (nitrox) breathing gas mixtures by a recognized training agency.

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Insight
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Remember that the rules you learned in your basic SCUBA certification course still apply to the diving you will do while using
a dive computer - some will become even more important. 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.
WARNING: Inspect your Insig t prior to every dive, c ecking for any signs of t e entrance of
moisture, damage to t e buttons, or damage to t e LCD display. If t ese or ot er signs of damage
are found, return t e unit to an Aut orized S erwood Scuba Dealer. DO NOT attempt to use it until
it as received factory service.
CONTROL BUTTONS
The Insight is a unique dive computer with interactive controls that allow you to select various display options and access spe-
cific information when you choose to see it. These are referred to as the L (LEFT) (L) and R (RIGHT) (R) buttons (Fig. 1).
The control buttons can be pressed repeatedly, or held in to scroll and continue as you set or ac-
cess different display modes.
On the surface the control buttons are used to activate the Insight; activate the backlight; access
the Date/Time, Fly, Plan, and Log modes; set variables such as FO2, Date/Time, etc.
The buttons can also be used to access an E ternal Access mode to download (copy) dive data to a
unique PC log/profile program.
Underwater, the buttons are used to activate the backlight and view Alternate displays of informa-
tion. Fi . 1 - Control Buttons
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FTFT
FT
PO2
PO2
NITROXNITROX
NITROX
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INTUITIVE DISPLAYS
The Insight uses Sherwood Scuba's unique Dive Profile Diagram (Fig. 2a) and easy to understand
symbols, displaying information where you would e pect it to be when looking at a log profile.
When you enter Special Situations, such as Decompression, High PO2, High O2, and Out of
Range modes, an UP Arrow symbol (Fig. 2b) will appear in the middle portion of the display as a
warning that a controlled ascent is required.
It is imperative that you understand the formats, ranges, and values of the information presented
by the Insight's numeric and graphic displays to avoid any possible misunderstanding that could
result in error.
NOTE: T roug out t is dive computer manual reference is made to t e
term ''breat ing gas'. T e rationale being t at t e Insig t can be used for
'air' dives or 'nitrox' dives. For clarity t ese terms are defined as -
Breat ing Gas - t e gaseous mixture breat ed during a dive.
Air - a breat ing gas t at contains approximately 21% oxygen and 79%
nitrogen (nature's common nitrogen-oxygen mixture).
Nitrox - a nitrogen-oxygen breat ing gas t at contains a ig er fraction of
oxygen (22 to 50%) t an air.
Fi . 2 - Profile & Arrow
Symbols
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Insight
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BAR GRAPHS
Two segmented bar graphs appear around the perimeter of the screen ne t to green, yellow, and
red color coded portions of the peripheral decal that denote normal, caution, and danger zones, re-
spectively.
When underwater, you can quickly focus on the bar graphs to make sure that they are in the
green and you are not getting too close to the no decompression limit or ascending too fast.
Ascent Rate Indicator (ARI)
The Ascent Rate Indicator located along the bottom of the LCD (Fig. 3a) is provided to help you
avoid e cessive Ascent Rates by providing a visual representation of ascent speed, rather than just
showing that you are ascending too fast.
The LCD displays up to 5 segments that may be considered an Ascent Rate speedometer. Green
is a 'normal' rate, yellow a 'caution' rate, and red is 'Too Fast'. The segments of the Ascent Rate
Indicator represent 2 sets of speeds which change at a reference depth of 60 feet (18 meters). Re-
fer to the chart at the right for segment values.
When your ascent rate e ceeds the ma imum recommended rate of 60 feet (18 meters) per minute
when deeper than 60 feet (18 meters) or 30 feet (9 meters) per minute when shallower than 60 feet
(18 meters), the bar graph segments will enter the red 'Too Fast' zone at which time the Audible
Alarm will sound and all 5 segments will flash once per second until your ascent speed is slowed.
Fi . 3 - ARI
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Ascent Rate Indicator
Deeper than 60 feet (18 m)
Segments Ascent Rate =
Displayed FPM MPM
0 0-20 0 - 6
1 21-30 6.5-9
2 31- 0 9.5-12
3 1-50 12.5-15
51-60 15.5-18
5 >60 >18
60 feet (18 m) & Shallower
Segments Ascent Rate =
Displayed FPM MPM
0 0-10 0 - 3
1 11-15 3.5- .5
2 16-20 5-6
3 21-25 6.5-7.5
26-30 8-9
5 >30 >9

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Nitrogen Bar Grap (NiBG)
The Nitrogen Bar Graph located around most of the perimeter of the LCD (Fig. 4a) represents tis-
sue loading of nitrogen, showing your relative no decompression or decompression status. As
your depth and elapsed dive time (BT) increase, segments will add to the graph, and as you ascend
to shallower depths, the bar graph will begin to recede, indicating that additional no decompres-
sion time is allowed for multilevel diving.
The Nitrogen Bar Graph also assists you with managing decompression by filling red 'ceiling stop
required' segments which are described in more detail in the Special Situations section of this
manual.
The Nitrogen Bar Graph monitors 12 different nitrogen compartments simultaneously and dis-
plays the one that is in control of your dive at that time. It is divided into a green No Decompres-
sion zone, a yellow Caution zone, and a red DECO (decompression) zone.
The yellow Caution zone gives a visual representation of just how close you are to the no decom-
pression limit which allows you to make a decision regarding safety stop duration or necessity.
The red DECO zone alerts you to focus your attention on the current required DECO stop 'ceiling'
depth indicated by the bar graph segment. When stop depths of 50 FT (15 M) and 60 FT (18 M)
are required, all red segments are displayed and the required stop depth (50 or 60, or 15 or 18) is
displayed numerically.
Fi . 4 - Nitro en BG
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Insight
AIRAIR
AIR
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BTBT
BT
AIRAIR
AIR
FTFT
FT
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DEPTH DISPLAYS
The Depth display indicates Depths from 0 to 330 feet (99.5 meters) in 1 foot (.5 meter) incre-
ments.
During a dive, Current Depth is displayed continuously on the Main display with the symbol FT
(or M) below it (Fig. 5a).
When the L (LEFT) button is pressed 1 time to view the first Alternate display, Maximum Depth
and the symbols MAX and FT (or M) are displayed in place of Current Depth.
In the event that you descend deeper than 330 feet (99.5 meters), the Depth display will show
three dashes (- - -) to indicate that you have gone 'out of range'. This is described in more detail in
the Special Situations section of this manual.
During a Decompression Dive, required Ceiling Stop Depths of 50 FT (15 M) and 60 FT (18 M)
are displayed in the lower/right portion of the LCD. This is described in more detail in the Special
Situations section of this manual.
DATE DISPLAY
The Date is displayed when the Insight is in Surface Mode (Fig. 6a/b). It is not displayed in any
other modes on the surface or during Dive Modes.
Fi . 5 - Depth (95 FT)
Fi . 6 - Date (June 13)
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TIME DISPLAYS
The Insight has three time displays.
The largest display is the Main Time display (Fig. 8 - top row of digits). Indicated are theoreti-
cal No Decompression Limit (NDL), O ygen Tolerance Limit (OTL), Elapsed Dive Time (BT),
Total Ascent Time (TAT), or Surface Time with the Wave symbol below it, depending on the op-
erating mode that the Insight is in.
A second Time display (Fig. 8 - middle row of digits) indicates Decompression Stop Time re-
quired at the stop depth indicated, or Time to Desaturate after a dive, depending on the operating
mode that the unit is in.
The third Time display (Fig. 8 - bottom row of digits) indicates Time of Day, or Time to Fly after
a dive, depending on the operating mode that the unit is in.
Each display is described in more detail in subsequent sections of this manual.
Time displays are shown in hour:minute format (i.e., 1:09 represents one hour and nine minutes,
not 109 minutes!). The colon that separates hours and minutes blinks once per second when the
display is indicating real time such as Surface Time, Bottom Time, and Time of Day. NDL, OTL,
TAT, Deco Stop Time, Time to Fly, and Time to Desaturate are calculated projections of Time
and use a solid (non-blinking) colon to indicate that they are counting down.
Fi . 8 - Time Displays
TAT
TAT
OTL
OTL
BTBT
BT
STOP
STOP
AM
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PM
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Insight
BTBT
BT
AIRAIR
AIR
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TEMPERATURE DISPLAY
While in the Surface Mode, Ambient Temperature (Fig. 9a) will be displayed for 10 seconds in
place of Surface Time when the L (LEFT) button is pressed. During a dive, Water Temperature is
displayed when the L (LEFT) button is pressed 2 times to view the Second Alternate display.
If the Temperature e ceeds a value of '99', two dashes ( - - ) will be displayed on the screen until
the unit's temperature decreases to '99'.
BACKLIGHT FEATURE
On the surface, while in Surface Mode or Fly Mode, the Insight's HydroGlo® Backlight will illu-
minate the display when the R (RIGHT) button is pressed and released. If the button is kept de-
pressed, the Backlight will not come on.
During a dive, the Backlight will illuminate the display when the R (RIGHT) button is pressed.
The display will remain illuminated as long as the Button is pressed, plus 10 seconds after being
released.
OPERATING TEMPERATURE
The Insight will operate in water temperatures from 28° to 95° F (-2 to 35 °C) and out of the water
from 20° to 140°F (-6 to 60 °C). At e tremely low temperatures, the LCD may become sluggish,
but this will not affect its accuracy. If stored or transported in e tremely low temperature areas
(below freezing), warm the module and battery with body heat before diving.
Fi . 9 - Temperature
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AUDIBLE ALARM
When Cautionary situations activate the Alarm, the Insight will emit a beeping sound as a warning. When the situation cor-
rected, the Alarm will cease. It will sound again if the same condition returns, or another Alarm condition occurs.
A single BEEP is emitted -
 after the unit performs a Diagnostic check upon push button activation.
 upon ascending to the No Deco Safety Stop depth of 20 FT (6 M).
ne BEEP per second is emitted for 10 seconds-
 upon entry into Decompression Mode.
 when PO2 reaches 1.40 ATA.
 when PO2 reaches 1.60 ATA.
 upon Ascending above a Required Decompression Stop Depth.
 upon Descending deeper than 330 FT (99.5 M).
 when Ascent rate e ceeds 60 FT (18 M) per minute when depth is greater than 60 FT (18 M), or 30 FT (9 M) per minute
at 30 FT (9 M) or shallower. The Beeping will continue until the Ascent speed is reduced.
 when O2 Accumulation becomes equal to or greater than allowable per dive limit, or limit for a 24 hour period.
 when the Decompression obligation requires a Stop Depth greater than 60 FT (18 M).
A single long BEEP is emitted for 3 seconds -
 when above a required Decompression Stop Depth for more than 5 minutes.
 when the Decompression obligation requires a Stop Depth greater than 70 FT (21 M).
 upon being on the surface for 5 minutes after a Delayed Violation (described in the Special Situations section).