Unlock Code to VPM Deco Algorithm for Shearwater Computers

Upgrade your Shearwater Predator, Petrel, or Perdix dive computer with the VPM-B decompression algorithm. This advanced algorithm offers a different approach to decompression modeling, providing you with additional options for planning and executing your dives.

How to Purchase:

• Enter your computer's model and serial number in the boxes above.
• Proceed to checkout.
• Your unlock code will be emailed to you within 24 hours (longer on weekends, as we are closed).

Note: You'll also need to update your computer's firmware to the latest version to utilize the VPM-B algorithm.

Understanding VPM-B:

The Varying Permeability Model (VPM) is a decompression algorithm that simulates bubble behavior in the body during decompression. Shearwater Research has implemented VPM-B according to the original Fortran specification by Erik Baker.

Shearwater's Enhancement:

Shearwater has added a VPM-B Gradient Factor Surfacing (GFS) option to address the potentially aggressive shallow stop times in standard VPM-B profiles. This ensures that a gradient factor of 90% is never violated, providing an additional layer of safety.

Key Features:

• Adjustable Conservatism: Fine-tune the algorithm's conservatism from 0 to +5.
• VPM-B and VPM-B/GFS: Choose between the standard VPM-B or the enhanced VPM-B/GFS option.
• Firmware Upgrade: Seamlessly integrates with your existing Shearwater Predator, Petrel, or Perdix computer.

• Adjustable conservatism (0 to +5)
• VPM-B and VPM-B/GFS (Gradient Factor Surfacing) algorithms
• Available as a firmware upgrade

• Compatibility: Shearwater Predator, Petrel, and Perdix dive computers