Over reliance on GPS on our roads has caused plenty of speculation about its detrimental effect on our natural navigation abilities and even on how it might cause parts of the brain to shrink. Others have speculated on the resulting chaos should a hacker/terrorist knock out the GPS system altogether. However, the many car accidents caused by GPS over reliance is not speculation. Here is why: GPS Often Inspires Blind Acceptance of Its Directions A GPS lulls its users into blindly following its recommendations and does this in an insidious way..