Although your Petrel comes unlocked for Nitrox, Trimix and CCR modes using Gradient Factors as an algorithm, many divers use software for planning which utilise the VPM algorithm. This unlock VPM key for Shearwater Petrel is purchased then usually with 1 – 2 days we will mail you the unlock code for your unit. Enter this into your Shearwater Petrel and enjoy using VPM – simple.
IMPORTANT – You must let us know the serial number of your unit for us to be able to generate the code for you. You can enter this at check out or email us Once your order is received the unlock code we will mail to you as quickly as we receive it. This can take 1 – 2 days, but often overnight given the time delay between Australia and the manufacturers time zones.