The Perdix from Shearwater Research of Canada is a full decompression dive computer incorporating the Bühlmann ZHL-16C decompression algorithm, with user configurable Gradient Factors (GF). Gradient Factors allow the diver unique and individual control of their dive computer decompression calculations. An optional PIN upgrade to the Varying Permeability Model (VPM-B and VPM-B/GFS) decompression algorithm is also available. Out of the box, the Perdix includes open-circuit and closed-circuit Air, Nitrox and Trimix mixed gas functionality. The standard firmware supports English menus and both imperial/metric units of measure. New with recent firmware updates are several enhanced navigation features for the three-axis tilt-compensated digital compass. A large full color LED LCD display.
The Shearwater Perdix model without the AI designation cannot be later upgraded to support tank pressure transmitters. Designed to accept any type of AA size battery including alkaline, lithium and rechargeables.