The program within the i300C simulates the absorption of inert gases 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 i300C dive computer model is based upon the latest research and experiments in decompression theory.
• If you exceed certain limits, the i300C will not be able to help you get safely back to the surface. These situations exceed tested limits and can result in loss of some functions for 24 hours after the dive in which a violation occurred.
Dive, Gauge, and Free Mode. Though the i300C is easy to use, you will get the most out of your new i300C if you take some time to familiarize yourself with its displays and operation.
GETTING STARTED BUTTONS The i300C utilizes 2 control buttons called the ADV (Advance) and SEL (Select) buttons. They allow you to select mode options and access specific information. They are also used to enter settings, activate the backlight, and acknowledge the audible alarm. Throughout this manual they will be referred to as the ADV and SEL buttons.
BUTTON FUNCTIONS ACTION BUTTON FUNCTION Press Button • to activate the i300C • to access Alt screens • to advance or step through menus • to toggle or change setpoints • to activate the backlight • to scroll quickly, changing setpoints •...
DIVE FEATURES DTR (DIVE TIME REMAINING) The i300C constantly monitors No Decompression status and O2 Accumulation, and will display whichever Time is the least amount available as DTR on the No Decompression Dive Main screen. The Time being displayed will be identified by the NO DECO or O2 MIN icons.
DEEP STOP When the Deep Stop selection is set to ON, it will trigger after descending deeper than 24 m (80 ft). The i300C then calculates (continually updating) a Stop Depth equal to ½ the Max Depth.
To view i300C logs, change settings, or switch modes you must navigate through the Surf Main Menu. Enter the menu by pressing the ADV button. When you reach the end of the menu the i300C will return to the Dive Surface Main screen.
(hr:min), which will generally occur prior to the FLY countdown reaching 0:00 (hr:min), the SAT time is to remain on the screen as 0:00 until the FLY counter shuts the i300C off, 24 hours after the last dive. NO PREVIOUS DIVES...
The Log only stores a short summary of each dive. Alternately, the PC Download function stores much larger files for each dive. For this reason, it is normal to see dives stored in the i300C's onboard Log that have already been overwritten in the PC Download Partition. If you do not remember to log or download your dives, they will be lost when the memory overwrites.
Within this screen you can select whether to use Air or Nitrox gas mixes. If Air is selected, the i300C will return you to the Set Gas Lead-in screen in the menu. If EAN is selected, the i300C will allow you to choose a...
DIVE SURFACE MODE 2. H2O ACT (Water Activation) The H2O ACT feature allows you to turn OFF water contact activation. WARNING: With H2O ACT turned OFF, you MUST remember to manually activate the i300C before any dive. SET H2O ACT...
Sleep Mode (screen is turned off) or a dive is started. The i300C returns to "sniffing" mode when the i300C returns to Surface Mode after a dive or a button is pushed to wake the com- puter from Sleep Mode on the surface. You will notice the Bluetooth® icon flashing as the Bluetooth®...
Download function stores much larger files for each dive. Depending on the chosen set- tings and dive durations, it is possible to see dives stored in the i300C's onboard Log that have already been overwritten in the PC Download Partition. Choosing a longer Sample Rate interval will consume less memory per dive.
Set Mode allows you to choose between diVE (standard recreational dive), GAUGE, and FrEE (free diving) modes of operation. NOTE: The i300C will be locked in Gauge mode for 24 hours after surfacing from any Gauge or Viola- tion Dive. Otherwise, you may switch modes freely while in any Surface Mode.
DIVE SURFACE MODE SN (SERIAL NUMBER) Information displayed on the Serial Number screen should be recorded and kept with your sales receipt; it will be required in the event that your i300C requires factory service. SERIAL NUMBER revision # serial #...
The Gas Menu allows you to manually switch gases during the dive. The Gas Menu Lead-in screen is bypassed if your i300C is set to Air or Gas 2 is set OFF. See the following section "Gas Switches" for further details on this feature.
DIVE ALT 2 This screen simply tells you the current time of day and ambient temperature. DIVE ALT 3 The ALT 3 screen displays information pertaining to nitrox; it is bypassed if the i300C is set for air. saturation 0 - 100...
ADV button to cycle through them. They are similar to the No Deco Main/Dive ALT 1, Dive ALT 2, and Dive ALT 3 displays. See Deep Stop in the Dive Features chapter for further details. NOTE: The i300C does not penalize for a missed Deep Stop. stop depth...
SURFACING Upon ascending to 0.9 m (3 ft) the i300C transitions to Dive Surface mode. For the first 10 minutes after a dive the i300C will continue to display the maximum depth and elapsed dive time. Once the surface time reaches 10 minutes the i300C will display the standard Dive Surface screen.
Lead-in If the current PO2 value is greater than 1.6, then a "HI PO2" warning not to switch will display. The i300C will maintain the current gas without switching. The diver may overide the i300C and force the gas switch by holding the SEL button during the "HI PO2"...
If gas 2 is set on and the current gas is not the best gas when approaching the decompression stop zone, the i300C will warn you to switch gases. You must confirm the gas switch by pressing the SEL button. If the gas switch is not confirmed within 30 seconds, no switch will be made.
Stop icon will be on solid. > If the DV1 status is ignored, the i300C will enter DV1 Surface mode for 5 minutes upon surfacing from the dive. VIO (Violation), Down Arrow icon, and SURF icon will be flashing. After 5 minutes on the surface in DV1 mode, the unit will enter VGM (Violation Gauge Mode).
Also, the Up Arrow icon, UP message will flash, and Current Depth/Max Depth/DTR will only indicate dashes signifying that you are too deep. * The maximum functional depth, 100 M (330 FT), is the depth at which the i300C can properly perform calculations or provide accurate display information.
To view i300C logs, change settings, or switch modes you must navigate through the Surf Main Menu. Enter the menu by pressing the ADV button. When you reach the end of the menu the i300C will return to the Dive Surface Main screen.
GAUGE MODE INITIATING A DIVE With the i300C activated, a Gauge dive will commence upon descending to 1.5 m (5 ft) for at least 5 seconds. Below is a diagram to help you navigate Gauge Dive Mode functions. GAUGE DIVE MAIN...
Also, the Up Arrow icon, UP message will flash, and Current Depth/Max Depth will only indicate dashes signifying that you are Too Deep. *The maximum functional depth, 100 M (330 FT), is the depth at which the i300C can properly perform calculations or provide accurate display information. Refer to the Specifications in the back.
No Deco Dive Time Remaining are carried over from one operating mode to the other, which permits the user to maintain awareness of nitrogen absorption and off-gassing status. • The mathematical models currently used in the i300C are based on no decompression/decompression multilevel repetitive dive schedules.
To view ALT screens, change settings, or switch modes you must navigate through the Surf Main Menu. Enter the menu by pressing the ADV button. When you reach the end of the menu the i300C will return to the Free Surface Main screen.
> LIGHt INITIATING A DIVE With the i300C activated, a Free dive will commence upon descending to 1.5 m (5 ft) for at least 5 seconds. Below is a diagram to help you navigate Free Dive Mode functions. FREE DIVE MAIN...
Alternately, the i300C is configured with a Data Port located on the side of the module that enables it to be con- nected to a PC through a USB port using a special interface cable that is available as an optional accessory. The USB Driver required for the interface system is downloadable from www.aqualung.com.
Instrument Lens Protector. Small scratches will naturally disappear underwater. • Soak and rinse the i300C in fresh water at the end of each day of diving, and check to ensure that the areas around the Low Pressure (Depth) Sensor, PC Interface Data Port, and buttons are free of debris or obstructions.
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• Inspect the button, lens, and housing to ensure they are not cracked or damaged. WARNING: If damage or corrosion is found, return your i300C to an authorized Aqua Lung dealer, and DO NOT attempt to use it until it has received factory prescribed service.
• No adjustments are made during any time that the Wet Contacts are bridged. • When diving in high altitude waters from 916 to 4,270 meters (3,001 to 14,000 feet), the i300C automatically adjusts to these conditions providing corrected depth, and reduced NO DECO and O2 MIN (O saturation) times at intervals of 305 meters (1,000 feet).
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