The Jack is a freediving computer with an algorithm developed to help prevent Taravana and Hemoptysis, which are potentially dangerous conditions associated with breath-hold diving. 

The Jack transitions from freediving to scuba with ease. It uses the Buhlmann ZHL-16B decompression model and allows for user-adjustable safety stop depths and times, including a deep stop.

The Jack is user-programmable for one gas nitrox mixtures up to 50 percent.

When diving, hiking or climbing the Jack serves as a 3-D compass with tilt-compensation up to 90 degrees. It also features an altimeter, barometer, temperature gauge and weather forecasting tool.

 Jack’s fitness functions track your every move as a pedometer that also displays distance, speed and calories burned.