USE OF GPS DEVICES
  
  
The use of any Global Positioning System (GPS), by a
  compeitor during compeition is illegal under Rule 
  4-5-8
  .  By receiving
  information, not available to other competitors, the runner is receiving
  assistance during the race.  This includes
  any GPS that is part of a wrist watch which would otherwise be legal, or any
  other separate device carried on the person of the competitior during the race.