It seems, the X) is already tested in real life.
See
http://www.ar.co.za/articles/rules.html
Standard Rules and Regulations for Adventure Racing in South Africa
Version 2: 3 May 2003
Restricted Equipment
Any firearm or weapon
Satellite navigation equipment i.e.
GPS - unless indicated in the Event Specific Rules
GPS wristwatches i.e. Timex Ironman and the
Suunto X9
I would like to know more about the
X9:
When?
Also an
X9 HR in the pipeline?
thanks
Markus