The primary thing that skydivers are required to be aware of at all times is their altitude. In various disciplines such as freeflying and wingsuiting the standard wrist mounted altimeter can be hard to see. Skydivers in these disciplines often use audible altimeters which play a tone but give no visual feedback. These audible altimeters are also only capable of notifying the skydiver as they approach their deployment and emergency altitudes. They do not have any affordance for maintaining awareness throughout the majority of the skydive. My helmet embedded altimeter fits inside the right or left audible pocket in most skydiving helmets and places a 1.8" display in the corner of the user's peripheral vision. The display shows the current altitude which can be read at a glance without a change in body position which might adversely effect the skydiver's flight attitude.
By combining a GPS and microSD card slot, the altimeter also give athletes the ability to analyze their performance by graphing their vertical airspeed, horizontal track, and glide ratio once they are on the ground.
Here are some slides from a presentation that I recently gave at Amazon. Feel free to click through the slides above while you read through the notes.
I was asked to come to HTML5 LA and talk a bit about CSS and preprocessors. Feel free to click through the slides above while you read through the notes.