Cochran Nemesis IIa NITROX User Manual

Dive computer
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Limited Warranty
To the original owner only, Cochran Undersea Technology, a division of Cochran Consulting, Inc.,
guarantees this dive computer to be free of defects in both materials and craftsmanship under
normal SCUBA use for 24 months from the date of shipment to your Authorized Dealer. Failing to
provide proper care will cause this warranty to be null and void. Any defect not excluded in the
limitations section below will be repaired, replaced, or replaced with a refurbished unit, at
Cochran Undersea Technology's discretion, free of charge. Purchaser is responsible for ship-
ping the product to the Cochran Undersea Technology Service Department and for all associated
freight and insurance costs. This warranty IS NOT transferable. All correspondence concerning
this warranty MUST be accompanied by a photocopy of the original sales receipt. The shipment
date is recorded on the outside of the product box.
Your warranty registration card must be returned to Cochran Undersea Technology within 15
days of the purchase date. Failing to do so will cause this warranty to be null and void. Charges
for the Annual Maintenance are not covered under this warranty. The Annual Maintenance
includes accuracy verification of the depth and pressure sensors, overall calibration and overall
performance. You should return your dive computer to the place of purchase for this service to
be performed.
WARRANTY LIMITATIONS AND EXCLUSIONS
This warranty DOES NOT cover any damages including, but not limited to, those resulting from
abuse, tampering, battery leakage, accident, or lack of proper care. Proper care includes having
an Annual Maintenance performed. Additionally, any modifications or repairs to this unit performed
by anyone other than an authorized Cochran Undersea Technology dealer will void this warranty.
All plastics, o-rings, batteries, or damage due to accident, abuse, modification, or tampering are
NOT covered.
STATEMENT OF LIMITED LIABILITY
A mathematical model is used by this dive computer to calculate nitrogen absorption into the body
as well as nitrogen elimination during a surface interval between dives. While great care and
extensive research has gone into the making of this model, variables such as, but not limited to,
dehydration, being overweight, age and old injuries may require a more conservative use of this
instrument. COCHRAN UNDERSEA TECHNOLOGY DOES NOT GUARANTEE THE PREVEN-
TION OF DECOMPRESSION SICKNESS OR ANY OTHER INJURY THAT MAY REQUIRE TREAT-
MENT IN A RECOMPRESSION CHAMBER. This dive computer should be used solely as a guide,
providing the trained and certified diver the information needed to make safe diving decisions. It is
expressly understood that by buying and/or using this dive computer, the diver assumes ALL risk
as to its quality, performance, and accuracy. Cochran Undersea Technology, its distributors, or
retailers will not be held liable for any personal injuries or other damages resulting from its opera-
tion, even if Cochran Undersea Technology has been advised of such occurrences and damages.
Cochran Undersea Technology supports and strongly agrees with maximum depth limits of 130
feet for recreational SCUBA diving, as set by recognized certification agencies. Cochran Undersea
Technology in no way encourages diving deeper than this limit. You should always adhere to safe
diving practices which include, but are not limited to, always using the buddy system, diving within
your own limitations, having your tanks filled only by a certified NITROX blending station, and
making only dives that do not require decompression.
(C) 1996 Cochran Undersea Technology
Nemesis IIa Nitrox Manual
1

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Summary of Contents for Cochran Nemesis IIa NITROX

  • Page 1 Limited Warranty To the original owner only, Cochran Undersea Technology, a division of Cochran Consulting, Inc., guarantees this dive computer to be free of defects in both materials and craftsmanship under normal SCUBA use for 24 months from the date of shipment to your Authorized Dealer. Failing to provide proper care will cause this warranty to be null and void.
  • Page 2: Fcc Label

    Consult the dealer or an experienced radio/TV technician for help. · MODIFICATIONS Changes or modifications not expressly approved by Cochran Consulting, Inc. could void the user’s authority to operate the equipment. SHIELDED CABLES This product is designed to be used only with the Analyst interface cable (RS-232) to...
  • Page 3: Patent Information

    Patent Information Protected under one or more of the following patents: 4949072, 4999606 591804 0305450 Other patents pending. All specifications subject to change without prior notice. Nem- esis is a trademark of Cochran Consulting, Inc. Copyright 1996 Cochran Consulting, Inc.
  • Page 4: Table Of Contents

    TABLE OF CONTENTS Limited Two-Year Warranty ........... 1 FCC Label ................2 Patent Information ..............3 Table of Contents ..............4 Introduction ................8 SECTION I. The NEMESIS™ IIa NITROX: OVERVIEW ..9 Nitrox-specific Functions Altitude Adaptation..............9 Intelligent Deep Dive Compensation ........ 9 Salt Water/Fresh Water Compensation ......
  • Page 5 DEPTH ................35 DIVE ................... 35 MAX DEPTH ..............35 Metric ................. 36 Mission OTU Dose..............36 REMAINing TIME AIR ............36 REMAINing TIME NDC ............36 REMAINing TIME DEC ............37 SURFace Time ..............37 TANK .................. 37 TEMP .................. 37 Time-To-FLY ..............
  • Page 6 SECTION V. TECHNICAL SPECIFICATIONS ...... 51 Replacement Parts ............53 SECTION VI. ACCESSORIES ..........55 Field Programmer ..............56 Limited 90-Day Warranty ..........56 Overview ................67 Installation ................. 67 Analyst ................... 61 Features of the Analyst Software Package ..... 61 Minimum Hardware Configuration ........
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  • Page 8: Introduction

    Introduction Your NEMESIS™ IIa NITROX Dive Computer from Cochran Undersea Technology is one of the most advanced instruments made for this application. It incorporates more user-programmable functions than any other dive computer made, yet is one of the simplest to use. Once your personal preferences and perhaps some dive site or condition-specific settings are entered, its computing power goes to work in the back- ground.
  • Page 9: Section I. The Nemesis™ Iia Nitrox: Overview

    The NEMESIS™ IIa NITROX: Overview In addition to its standard time/depth-based decompression algorithm, the NEM- ESIS™ IIa NITROX has incorporated the influence of additional physiological factors such as Altitude, Temperature, Ascent Rate, and Workload. However, the NEMESIS™ IIa NITROX allows the diver, via the optional Analyst PC Interface, to disable the Tem- perature and/or Workload decompression compensation should the diver deem a particular diving situation would so warrant.
  • Page 10: Three-Blend Capability

    Enriched Air Nitrox, Three-Blend Capability Your NEMESIS™ IIa NITROX has the unique ability to provide the diver with the ability to select a single bottom mix and TWO decompression mixes. Using the included Field Programmer, you can set the oxygen percentage for the three different mixes within the following ranges: Mix 1: 21.0% to 50.0% in 0.1% increments...
  • Page 11: Equivalent Air Depth

    calculated. The ability to switch mixes MUST be enabled via the Analyst. If you do not have this program, your Authorized Dealer can perform this operation. In addition, Mix 1 is always calculated for the first ten minutes of each dive regardless of the BP.
  • Page 12 For example, if you were diving to 86 feet with NOAA II your PPO level would be: 3.6 ( or 86 ¸ ¸ ¸ ¸ ¸ 33 + 1) X .36 = 1.296 which would be rounded up to PPO = 1.3.
  • Page 13: Installation

    Installation The Tank Unit (TU) high-pressure sensor installs into a high-pressure port of your first-stage regulator. This should be done by your Authorized Dealer at the time of purchase. Should you choose to install the TU yourself: 1. Remove your current high-pressure hose or the high-pressure plug from your first stage regulator.
  • Page 14 You cannot manually turn the TU off. The TU will turn off: After 15 minutes if no tank pressure is sensed and no dive is made. After all 12 half-time compartments are completely "off-gassed" on repetitive dives. During an extended surface interval, the TU will enter a "sleep" mode to conserve battery life.
  • Page 15: Operating Modes

    OPERATING MODES Self-Diagnostic Mode At turn-on, both the TU and WU complete self-diagnostic tests before displaying cur- rent information. During these tests, all of the legends and digits on the WU illuminate for approximately five seconds. Upon completion, your computer enters the Surface Mode.
  • Page 16: Surface Mode

    Surface Mode At the completion of the Self-Diagnostic Mode, the NEMESIS™ IIa NITROX enters the Surface Mode. The Surface Mode has two displays: a Main Display and an Alternate Display. You may switch to the Alternate Display by rotating the wrist quickly or tapping firmly on the face of the WU.
  • Page 17 Surface-Mode FIG-3 Alternate Display LEGEND MEANING VALUE SHOWN PAGE BOTTOM bottom time of last dive 1:26 (1hour 26 minutes) 33 ending breathing parameter of last dive...
  • Page 18: Predive Prediction Mode

    Predive Prediction Mode FIG-4 Main Display After one minute of Surface Mode, the dive computer will automatically enter the Predive Prediction Mode. During this mode, predictions of no-decompression limits (NDC) or air time remaining (whichever is the lesser) will be made in ten foot increments beginning at 30 feet and ending at a depth having at least two minutes of NDC time available, up to a maximum predicted depth of 160 feet.
  • Page 19: Cns/Otu Toxicity Percentage Display

    Beginning NDC Limits BEGINNING NO-DECOMPRESSION LIMITS (IN MINUTES) DEPTH U.S. NAVY DSAT NEMESIS™ II NITROX 30 FEET ——— ——— 40 FEET 50 FEET 60 FEET 70 FEET 80 FEET 90 FEET 100 FEET 110 FEET 120 FEET 130 FEET 140 FEET 150 FEET ——...
  • Page 20: O2 Mix Display

    Mix Display Following the CNS/OTU Toxicity Percentage Display, the current oxygen percent- ages for Mix 1 and Mix 2 are displayed as a factor of 10. For example, an oxygen percentage of 35.5 would be displayed as 355. Mix 1 will be displayed under the TANK legend and Mix 2 will be displayed under the DEPTH legend.
  • Page 21: Battery/Altitude Display

    Battery/Altitude Display The two digits under the DEPTH legend indicate the current TU battery voltage as a factor of 10. For example if the TU's battery voltage is 5.8 volts, the two digits under the DEPTH legend would display 58. The numbers under the TANK legend display altitude in 1000 foot increments.
  • Page 22: Logbook Mode

    Logbook Mode While your NEMESIS™ IIa NITROX is in its normal Surface Mode, you can access the Logbook Mode. To do this, tap the crosshatched area labeled "PWR" on the TU. This will cause the display to change on the WU to the Logbook Mode. A feature of your NEMESIS™...
  • Page 23 Logbook Mode FIG-14 Alternate Display LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME AIR the minimum calculation 0:20 (20 minutes) of either NDC, AIR or the total decompression time recorded for this dive. CEIL maximum ceiling stop 0 feet required average breathing parameter for dive DEPTH average depth of dive...
  • Page 24: Subsurface Mode

    Subsurface Mode FIG-8 Main Display The Subsurface Mode activates when the dive computer senses a depth greater than five feet and is exited when the dive computer senses a depth less than three feet. LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME AIR REMAIN TIME NDC lesser of the two 0:22 (22 minutes of...
  • Page 25 Subsurface Mode FIG-9 Alternate Display LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME AIR greater of the two 2:47 (2hours 47 minutes 36 of remaining AIR time) REMAIN TIME NDC TEMP current temperature 58 deg. F current breathing parameter MAX DEPTH maximum recorded depth 87 feet...
  • Page 26: Emergency Decompression Mode

    WARNING: Your NEMESIS™ IIa NITROX should not be used for deliberate decom- pression diving, but merely as an aid to assist you during ascent should you mis- takenly overstay your no-decompression limit. Cochran Undersea Technology in no way encourages deliberate decompression diving.
  • Page 27 Emergency Decompression Mode FIG-10 Main Display Should a diver enter the Emergency Decompression Mode, the following informa- tion is shown on the Main Display. LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME DEC amount of time 0:15 ( 15 minutes) remaining at this CEILing.
  • Page 28 Emergency Decompression Mode FIG-11 Alternate Display The following information is provided on the Alternate Display while in Emergency Decompression Mode. LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME AIR remaining air time 0:30 (30 minutes) TEMP water temperature 68 deg. F breathing parameter MAX DEPTH greatest depth reached...
  • Page 29: Gauge Mode

    Conditions That Will Cause Gauge Mode Violating certain conditions will cause your dive computer to cease providing remain- ing time information and stop calculating nitrogen absorption/elimination. When this occurs, your unit has entered its Gauge Mode. Once in this mode, 24 hours of surface time MUST elapse without a dive being made before the system will re- sume its normal operation.
  • Page 30 Gauge Mode FIG-12 Main Display NOTE: Only one display is available when in Gauge Mode. LEGEND MEANING VALUE SHOWN PAGE TEMP water temperature 55 degreesF ASCENT rate at which you 31-40 feet per minute are ascending BOTTOM current time either 3:36 ( 3 hours 36 minutes)33 on surface or submerged SURF...
  • Page 31: Section Iii Explanations

    SECTION III EXPLANATIONS...
  • Page 32: Altitude Diving

    EXPLANATION OF FUNCTIONS Altitude Diving Your NEMESIS™ IIa NITROX senses the barometric pressure for altitudes up to 15,000 feet above sea level. Barometric pressures at a given altitude can change due to high and low-pressure weather systems as well as temperature. When compared with most analog depth gauges at altitude, the NEMESIS™...
  • Page 33: Ascent Rate Bar Graph

    Ascent Rate Bar Graph: The Ascent Rate Bar Graph is comprised of a vertical five-segment bar. With the optional Analyst Personal Computer Interface, you can select this bar graph to either represent the speed of your ascent or a percentage of the selected maximum ascent rate.
  • Page 34: Ceiling

    Breathing Parameter (BP) is a measure of your breathing efficiency. The more you dive, the more efficient your breathing becomes. With your dive computer, you will be able to monitor and log your progress. The number displayed is the amount of air you breathe per minute in psi normalized to the surface (one atmosphere).
  • Page 35: Depth

    Depth: The numbers under the DEPTH legend are used to display the current depth. Subsurface Mode : The numbers under the DEPTH legend are used to display the current depth. Your dive computer has the intelligence to automatically deter- mine if you are diving in fresh or sea water thereby providing you with the actual depth for the type of water in which you are diving.
  • Page 36: Metric

    Metric: This legend indicates that the dive computer is set to calculate and display altitude, depth, and tank pressure values in the METRIC mode. Altitude and Depth will be calculated in meters. Tank pressure will be calculated and displayed in either BAR or Kg/cm2.
  • Page 37: Remaining Time Dec

    Remain Time DEC: Emergency Decompression Mode : The time displayed will be dependent upon how the dive computer has been setup. The information displayed will be either: Total time to complete all required decompression - or - Time Remaining at each individual stop - or - Alternating between total and stop time.
  • Page 38: Time-To-Fly

    Time-To-Fly: Surface Mode : If you plan to fly after diving, you must first allow time for your body to eliminate all of the residual nitrogen it has absorbed from diving. Your dive computer calculates this for you and displays the hours you must wait before safely flying or traveling to altitude after diving.
  • Page 39: Audible & Visual Warnings

    AUDIBLE & VISUAL WARNINGS In this chapter you will learn to recognize the audible and visual warnings that your dive computer may issue to alert you of a potentially hazardous condition. User Defined Maximum Depth: During the Predive Prediction Mode, you have the ability to define a maximum depth to which you wish to dive.
  • Page 40: Ceiling Violation

    If you are in the Emergency Decompression Mode and the remaining air time is either equal to or is less than the total decompression obligation, both the AIR and DEC legends will appear. Remaining Decompression Time is ALWAYS shown on the Main Display while the Remaining Air Time in this mode is ALWAYS displayed on the Alternate Display.
  • Page 41: Gauge Mode Alarm

    WARNING: Properly replacing the batteries from the TU will not cause your dive computer to lose current nitrogen absorption and elimination data for the most recent dive or dive series. See the section regarding BATTERY REPLACEMENT in this manual. Gauge Mode Alarm: You will hear your dive computer sound its five-chirp alarm just prior to entering the Gauge Mode.
  • Page 42: Maximum Ppo2 Alarm

    NOTE: If both CNS and OTU levels are greater than 75 percent, the more critical of the two's percentage will be displayed. FIG-15 OXYGEN TOXICITY WARNING DISPLAY Maximum PPO2 Alarm: This alarm, settable via the optional Analyst interface, allow you to set a desired maximum PPO2 level from 0.5 to 1.6 ATA.
  • Page 43: Questions And Answers

    Is this coin cell replaceable? The coin cell can only be replaced by Cochran Undersea Technology since it requires the opening of the TU. By keeping charged batteries in the TU, the battery life of this coin cell is expected to be over ten years.
  • Page 44 What happens if the battery compartments flood? The electronics of both the TU and WU are completely environmentally sealed. The construction of the battery compartments will not allow water to enter the electronics. If you have flooded the battery compartments, first rinse the compartment as soon as possible with fresh water.
  • Page 45: Section Iv Care And Maintenance

    SECTION IV CARE AND MAINTENANCE...
  • Page 46: Normal Care And Maintenance

    NORMAL CARE AND MAINTENANCE Rinsing and Cleaning Your dive computer is designed to require minimum care and maintenance. Both the TU and WU are molded from fiberglass reinforced resins that are extremely resistant to salt, chlorine, and exposure to ultraviolet light. However, both the TU and WU contain sophisticated electronic components, and therefore, require reasonable care and treat- ment.
  • Page 47: Battery Care

    There are factors which can significantly vary battery operating life. These include: Original quality of battery as manufactured. · Age of battery prior to installation. · Length of time batteries have been installed. · Frequency and cumulative number of WARNINGS issued by the computer. ·...
  • Page 48: Annual Maintenance

    ANNUAL MAINTENANCE An Annual Maintenance Service is an important part of your dive computer’s Care and Maintenance Schedule. Returning your computer to your Authorized Dealer on or about the anniversary of your purchase date will allow you to keep your computer in absolute top diving condition.
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  • Page 50: Section V Technical Specifications

    SECTION V TECHNICAL SPECIFICATIONS...
  • Page 51: Specifications

    SPECIFICATIONS (Subject to change without notice) No-Decompression Model Algorithm: Modified Haldanean Number of Half Time Compartments: Decompression Ceilings Ceiling Depths: 10, 20, 30, 40, 50, 60, 70, 80, 90 feet 3, 6, 9, 12, 15, 18, 21, 23, 27 meters Altitude Diving Model Procedure: Altitude adjust is seamless from sea level to 15,000 feet (4600 meters) above sea level.
  • Page 52: Replacement Parts

    OPERATIONAL Depth/Max Depth 327 feet / 99.9 meters Depth Gauge Range 327 feet / 99.9 meters Tank Pressure 5119 psi 353 BAR 360 Kg/cm2 Clock Timer 17 hours 03 minutes Logbook 300 dives Dive Of The Day Counter 9 dives Altitude 15,000 feet / 4,600 meters Altitude Functional Range...
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  • Page 54: Section Vi. Accessories

    SECTION V ACCESSORIES...
  • Page 55: Field Programmer

    Field Programmer LIMITED 90-DAY WARRANTY To the original owner only, Cochran Undersea Technology, a division of Cochran Consulting, Inc. guarantees the Field Programmer to be free of defects in both materials and craftsmanship under normal SCUBA use for 90 days from the date of purchase. Failing to provide proper care will cause this warranty to be null and void.
  • Page 56: Overview

    Overview The Field Programmer is designed to be used with the NEMESIS™ IIa NITROX Dive Computer. IT IS NOT COMPATIBLE WITH PREVIOUS NEMESIS SERIES. This device allows the user to program into the dive computer a value representing the percentage of oxygen contained in a given breathing gas mix for all three mixes, the cylinder size which is used in making Workload computations, an added degree of conservatism from 0 to 50%, and a maximum depth alarm.
  • Page 57 While the Nemesis IIa Nitrox is in the normal Surface Mode, tap the TU on the PWR circle one time. You should see the WU display change to the program- ming display. Using the INCREMENT button (the one closer to the data probe wire), program the 10's digit.
  • Page 58 For the depth benchmark programming, the WU display a lower case d. This depth benchmark is set in 1-foot increment down to a maximum of 30 feet. First, you will program the 10's digit (d-2) followed by the 1's digit (d-1) Next, you will program the cylinder size you are using in liters.
  • Page 59 Elapsed Bot Time for Mix 3 Activation (nitrox) Depth Limit for Mix 3 Activation (nitrox) Cylinder Size in Liters...
  • Page 60: Analyst

    OPERATION OF THE PC INTERFACE The Analyst Personal Computer Interface is a complete hardware/software system that uploads data from the NEMESIS IIa NITROX dive computer to an IBM or compat- ible Personal Computer. Along with data that is retrieved from the dive computer, the Analyst allows the diver to customize the dive computer and also to enter and store additional information for each dive in a logbook data base.
  • Page 61: Quick Start

    INSTALLATION OF THE ANALYST SOFTWARE TO THE PC If you are comfortable with installing software and are familiar with the hardware configuration of your system, follow the instructions in the following section titled "QUICK START". Otherwise, please go to the "DETAILED SOFTWARE INSTALLATION" section. QUICK START Place the installation diskette into your Personal Computer's diskette drive.
  • Page 62: Installation Of The Data Probe To The Pc

    The next screen will display the options that you have selected and give you the option of either running the Analyst program, redoing the installation, or exiting the program. If you are still unsuccessful with the installation, please contact Cochran Undersea Technology at (214) 644.6284...
  • Page 63 FIG-21 NOTE: Snapping the data probe onto the sport dive computer will often cause the dive computer to turn on, with resulting “beeps”. This is normal. It is NOT necessary for the dive computer to be on for data to be uploaded. However, do not start the upload while the dive computer is “beeping”.
  • Page 64: Keyboard Keys And Their Usage

    KEYBOARD KEYS AND THEIR USAGE The following list describes the keyboard key combinations and what function they perform. <ALT + B> Converts the displayed data to METRIC with tank pressure converted to BAR <ALT + C> Selects the CONFIGURATION menu <ALT + D>...
  • Page 65: Uploading Dive Data

    UPLOADING DIVE DATA After the Data Probe is installed on the dive computer and the program is installed on the Personal Computer (PC), you are ready to upload dive data to a file on the PC. To do this from the C:\ANALYST> prompt, type: ANALYST and press <ENTER>...
  • Page 66: Statistics

    If you have created a file and uploaded data to it for the first time, the program will go immediately to the main menu page after data is uploaded. Note that once your dive computer's total storage capacity has been reached, the oldest data will be "pushed out"...
  • Page 67: Profiles

    PROFILES The PROFILES menu provides you with different profiles relating to your dive. These are: DEPTH / TANK PRESSURE DEPTH / BREATHING PARAMETER DEPTH / ASCENT RATE DEPTH / TEMPERATURE DEPTH / NITROX PPO2 DEPTH / NITROX CNS% DEPTH / NITROX OTU% The Depth graph will remain constant regardless of a selected profile screen for a particular dive with its scale displayed on the far left of the graph.
  • Page 68 You will note that at the bottom center section of the screen, the values intersected by each marker are identified as well as the difference between the two. LEFT is for the Left Marker, RIGHT is for the Right Marker, and DIFF is the difference between the two markers.
  • Page 69: Logbook

    LOGBOOK You may access this area by using the mouse as described in the FILES section, or you may depress <ALT + L> on the keyboard. This will display the options available on the LOGBOOK menu. Selecting any of the options will cause the logbook data entry screen to appear.
  • Page 70: Printing

    By submitting your research files to DAN, you will be assisting in the development of future decompression algorithms. To obtain additional information regarding this program, contact: Research Dive Team Co-ordinator Cochran Undersea Technology 1758 Firman Drive Richardson, Texas 75081 P 214.644.6284...
  • Page 71 EXPLANATION OF TERMS GENERAL STATISTICS Tank Unit Serial Number: This identifies the entire serial number of your Tank Unit. Wrist Unit Serial Number: This identifies the entire serial number of your Wrist Unit. File Originated On: This is the creation date of your filename. File Last Updated On: This is the date of your last upload to this program.
  • Page 72 Breathing Parameter: This is the beginning breathing parameter. Battery Voltage: This is the voltage of the Tank Unit batteries at the beginning of the dive. Time-To-Fly: This is the remaining wait time before flying, as of the beginning of the dive, shown in hours and minutes.
  • Page 73 Missed Deco. Time: This is the remaining decompression time after the dive, shown in hours and minutes. It should read 0:00 on all no-decompression dives and all emergency decompression dives where the required decompression stops were completed. Should you omit any decompression stop time, the remaining omitted time will be displayed here.
  • Page 74 CONFIGURATION STANDARD Dive Time/date Stamp: This is the internal clock setting that is used to timestamp each individual dive. The time displayed is the recorded time when you began the current uploading of your dive computer. To change the setting of the clock, highlight this option and press <ALT + D>.
  • Page 75 NCD COMPS Select Altitude <2000 feet as One Zone: From the factory, your unit is set to sense altitude seamless from sea level to 15,000 feet above sea level. What this provides is the "actual" altitude for any given day at any diving location. With weather move- ments, it is possible, even expected, to have a different altitude at the same dive site from day to day.
  • Page 76 Select NITROX computations: This option enables and disables NITROX compu- tations. If this option is disabled, mixtures greater than 21.0% oxygen will be disallowed. The factory setting for this option is ON. Select Field Programer option: This option enables and disables the ability to use your computer with the Field Programmer.
  • Page 77 Enter Breathing Parameter Alarm Lower Limit: If you have enabled the breathing parameter alarm, you will need to set the lower limit below which the alarm will sound. To make this entry, highlight this option with the middle mouse button and using the keyboard, enter the desired setting and press <ENTER>.
  • Page 78 Enter Remaining Time Response: This option determines the responsiveness of the displayed remaining no-decompression time. If you wish to have you data "immediately" updated, you should select a setting from 0 to 3. This setting is suggested for deep, technical diving which usually accompanies fast descent rates. For recreational diving, a slower responsiveness is suggested.

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