http://www.gizmag.com/recon-instruments-gps-goggles-skydiving/24669/

For the past several ski seasons, Recon Instruments has been
designing, tweaking and partnering with other companies on its GPS-based ski
goggles, which provide real-time feedback about speed, distance, vertical and
other key indicators. The company has now officially re-purposed its technology
for skydiving, BASE jumping and wing suit flying.

We don't think it's a coincidence that Recon chose last week, a week when the
world's attention was focused on skydiving like never before, to announce its
new Flight HUD system. Like Recon's ski system, the Flight HUD is a
goggle-mounted heads-up display that provides crucial data to the wearer. It
uses some of the same sensors – GPS, altimeter and accelerometer – to calculate
and display forward speed, glide ratio and altitude. The Flight HUD also doubles
as a traditional ski HUD at the flick of a switch, allowing for dual usage.

Thanks to Patrick.