There were some questions about HLT and karting...well this is not a racing kart but look for yourselves:
[youtube]
http://www.youtube.com/watch?v=vC-YHumLbtU[/youtube]
Recorded with iPhone 4, Optrix XD wide lens case mounted in front of helmet, Dual XGPS150 on left wrist (like a watch). The track is verfy bumpy, it's not the case shaking!