If the challenge is vertical and the destination the next summit, then you need a watch that you can depend on 100%: The Highlander

Eco Drive Quartz caliber J250 movement. Diver`s profesional watch ISO6425. Charges in Sunlight or Indoors. No Batteries to Change. 

A new design of an easy-to-use dive computer with freedive mode and air integration

A new design of an easy-to-use dive computer with freedive mode and air integration