Why is the depth of my Cochran Computer reflecting different depths than my other computer?

Cochran Computers are the only dive computer that knows if they are in fresh or salt water. The depth readings of other dive computers are only correct when they are being dived in the same water that they were calibrated for. A computer calibrated for freshwater will have a 3% depth error in saltwater. Also remember that the depth being shown for the Gemini is measured by the Tank Unit not the Wrist Unit.

In Analyst, Why does the "Beginning and Ending Dive Statistics" screen reflect my "Beginning Entered or Computed FO2" as 21.0% instead of the mix that I entered?

The "Beginning and Ending Dive Statistics" screen will reflect the surface mix as 21.0%. Once you enter your dive, the computer will switch and read the correct mix that is entered. This can be verified by the "View This Dives Profile" screen, which is accessed through the "View Dive Statistics" tab, as it will show the "Normal Nitrox Blend" for that particular dive. The switching can also be verified through the "View Profiles Graph" tab by clicking on the "02 %" tab. Once you enter the dive, the computer will show when it switched to the FO2 mode.

I have a dive computer that I would like to trade in on a new Cochran Computer. Do you have a trade in program and what trade in process?

Yes, Cochran does have a trade in program that will accept all makes and models of dive computers. The first step is to go to www.divecochran.com to view the new computers and complete a trade in form that includes the options that you wish to have on your new computer. Second, you would then email your completed trade in form to sales@divecochran.com or fax it to the attention of Sales at 972-644-6286. If you decide to accept the quote for your trade in, you would have 30 days to get your computer to Cochran to complete the trade in process.

I have a Cochran Gemini Wrist Unit dive computer and the LCD pulses when I'm in the program mode. Do I need to send my computer in to have it checked?

You do not need to have your computer sent in. The LCD will have a slight pulsating effect when you are in the programming modes. This is a normal function of the Cochran Gemini Wrist Unit. Also when the Wrist Unit in not in communications with the Tank Unit the display will dim slightly.

Is it okay to remove the batteries from my Cochran Dive Computer when I'm getting ready to store it until the next dive season?

Your Cochran Dive Computer is not like most cameras or other small electronic devices. You will need to keep fresh batteries in your Cochran Dive Computer at all times. Depending on the model of the Cochran Dive Computer, if fresh batteries are not kept in it at all times, the computer memory could be effected and the date and time stamp will be incorrect. If the batteries are removed after a dive your previous nitrogen loading may be lost and this may affect nitrogen calculations on near-future dives.

How can I program the Taclite on the Cochran Gemini to stay on longer?

The amount of time that the Taclite will stay on is set via Touch Contact Programming or through the Analyst Software. The Taclite will turn on for the preprogrammed number of seconds from 1 to 98. However, if 0 is entered the Taclite will never turn on. If 99 is entered, the Taclite will stay on continuously and only turn off when the computer does.

Why won't the Taclite on the Cochran Gemini activate as soon as I enter the water?

The Taclite will not activate until you descend past 5 feet. If you activate the Taclite before entering the water, it will stay for the programmed amount of time regardless of depth.

I have a Cochran Gemini dive computer and the Wrist Unit will not power up after going to sleep. What is the cause of this and how do I correct it?

If communication between the Wrist Unit and the Tank Unit is lost, while cylinder pressure is being displayed and the Wrist Unit goes to "sleep", the Wrist Unit will not respond to bridging or shorting contacts 1 and 2 ( will not wake up). In order to "wake-up" the Wrist Unit a battery reset will have to be performed.

To perform a battery reset:
1) Remove the battery cap using the battery replacement tool
2) Remove the top battery
3) Reinsert battery in backwards (negative end in first)
4) Replace the battery cap
5) Wait about 15 seconds
6) Remove the battery cap
7) Remove the top battery
8) Reinsert the battery correctly (positive end in first)
9) Replace the battery cap

To prevent this Wrist Unit condition, ensure that the Wrist Unit is displaying zero cylinder pressure before it is separated from the Tank Unit. Also, if you need to be separated from your tank unit for more than 15 minutes, if cylinder pressure is applied, you may want to strap your Wrist Unit to your BC until you are ready to get back into the water.

Examples of conditions that can cause loss of communications are:
The diver removes his/her BC and walks/swims out of communications range, while cylinder pressure is being displayed and is wearing the Wrist Unit. In approximately 15 minutes the Wrist Unit will go to sleep.
If the diver is using a rebreather and has the Tank Unit mounted horizontally at the bottom of the unit. When the rebreather is stored in the vertical position at the end of the day, it is possible for steel boat deck to reduce the communications range to the point that a Wrist Unit mounted on the BC or laid on top of the rebreather shell will be out of communications range and then go to sleep while showing cylinder pressure.

I have a Cochran Gemini dive computer and I'm getting Oxygen Toxicity warnings during a normal dive. What may be causing these warnings?

The warnings may be a result of your diving style. For example, prior to your dive, if you're breathing on your regulator for a very short time to check the gas flow and you stop breathing and walk away for a period of time the computer will not recognize that a constant breathing parameter has been established. If the computer does not read a constant breathing parameter it will switch to your second mix setting when you start breathing regularly from your regulator. If you have your computer set to 80%, and you descend below 33', the computer will read 100% oxygen toxicity.

To prevent this from happening, when you are ready to start your dive, breath normally from your regulator for about a minute. This allows the computer to calculate a constant breathing parameter and/or wait a few moments on the surface to allow the computer to calculate your breathing parameter prior to a descent.

If you are getting these types of warnings and you have the Analyst software, view your graph profiles to see if at the beginning of the dives in question your computer may have switched to your second mix at a depth deep enough to cause a PO2 value above the alarm set point.

My GEMINI Wrist Unit loses communications with the Tank Unit when I use my underwater lights, why?

Cochran has determined that the light heads of the HID (High Intensity Discharge) underwater light systems generate and radiates a significant level of electronic "noise". If the Gemini Wrist Unit is within 12" to 18" of the light, this noise will prevent the WU from maintaining communications with the Tank Unit. Likewise, the HE-13N fluorescent system manufactured by UNDERSEA VIDEO HOUSINGS also radiates a sufficient noise level to interrupt WU / TU communications.

Cochran engineers are investigating ways to minimize the effect. To reduce the effect of the noise, increase the distance between the lights and the WU.

When I attempt to program my GEMINI Wrist Unit for the Clock function, I can not program the Time of day Clock, why?

The "Clock" function of the Gemini Wrist Unit is a function that is available on the Intelligent Wrist Unit. To utilize the Clock feature the Wrist Unit MUST be in the Independent Mode NOT in the Slave mode. If you inadvertently attempt to program the Clock while the Wrist Unit is in the Slave mode, just switch the Wrist Unit into the Independent mode and access the Clock mode, as described in the manual.