Poseidon M28 (0600-200)

Special Order
The M28 is a technical dive computer that includes open-circuit and closed-circuit Air, Nitrox and Trimix mixed gas functionality and supports CANbus connectivity to Poseidon Se7en rebreathers.

The M28 is not a regular stock item at DGX and in some cases may not be in-stock at the US distributor. Please contact us regarding availability and lead time for delivery before ordering. Note that the M28 will be received with a current firmware load. You may need to update the firmware in your Poseidon CCR for compatibility. The M28 should NOT be downgraded to a previous firmware release.

Poseidon M28 (0600-200)

Poseidon M28 Dive Computer
Poseidon M28 Dive Computer Poseidon M28 (0600-200) Poseidon M28 (0600-200) Poseidon M28 (0600-200) Poseidon M28 (0600-200)
  • The ideal technical dive computer for your Poseidon Se7en CCR!
  • Includes Air, Nitrox and Trimix functionality
  • Dual Deco Algorithm (DCAP and Bühlmann ZHL16C with gradient factors)
  • CANbus connectivity provides full configuration and control of Se7en in the field

The M28 is a technical dive computer incorporating both the Bühlmann ZHL-16C decompression algorithm with gradient factors and DCAP (used in the Se7en CCR.) The M28 includes open-circuit and closed-circuit Air, Nitrox and Trimix mixed gas functionality. The M28 supports English language menus and both imperial/metric units of measure. This Poseidon M28 package includes: Poseidon M28 Computer, carrying case, dust bag, charging cable and bungee cord. The M28 provides an external CANbus connector but please carefully read our notes below regarding additional cables required, depending on desired options.

  • Technical dive computer with 2.8-inch TFT LCD Color Display
  • Easy menu based user interface with two button control
  • Dual Deco Algorithm (DCAP and Bühlmann ZHL-16C with gradient factors)
  • 3-axis digital compass with tilt compensation
  • Graphics image file storage and display
  • Depth rated to 200M/656 ft
  • Wireless connectivity: Wi-Fi, Bluetooth
  • Internal smart battery rechargeable via any 1.0A USB-A port using supplied cable
  • Dive-by-Wire™ functionality with Poseidon's Rebreather Management System
  • Supports communication with optional Poseidon CANbus devices.

Note: The M28 can be used as a stand-alone dive computer and there are optional configurations to connect the M28 to other devices. A typical configuration is to connect the M28 to the SE7EN rebreather by replacing the display paddle or to monitor a Solid State Oxygen Sensor; to do this you will need to also purchase one or more of the Connecting Cable M2 (0000-690). When connected in CCR mode with the Se7en, the M28 currently only supports the DCAP algorithm. The M28 is described by Poseidon as having GPS and maps capability, but our current experience is that takes such a long time to acquire satellite data that GPS functionality is not useful in practice.

More Information
Brand Poseidon CCR
SKU PR-0600-200
Weight 3.000000

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Reliability is a Concern
Mar 4, 2019
The initial unit I received had a problem with the depth sensor, which as I have learned plagued a number of early units (purchased August 2017). The unit had to be shipped back to Sweden for repair, but it was fixed at no charge other than shipping (pricey to insure an $1800 item to Sweden). Recently I had an issue where the computer just would not accept a charge or start up. Through communication with other owners I resolved that issue on my own. I will say that all communication with Poseidon in Sweden was great, and as mentioned they did fix my computer. It is a lengthy process however to ship to Sweden, await repairs, and receive the computer back (it amounts to a lot of missed diving). With the issues, it has been successful for me on six dives so it has been an extremely costly item per dive thus far. There are a lot of features but accessing a lot of them are not the friendliest to include the process of updating the firmware to the unit. The battery life is a concern, especially since you need to have access to a USB charger to charge the battery. I'll keep my fingers crossed that the unit continues to be improved through firmware updates but as of now I feel like I'm clinging to hope to justify the purchase.
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