This is the simplest portable GPS locating device available, ideal for finding your car after shopping, returning to a favorite spot on the beach, or returning to camp. Simply push a button to mark your current location and the device points the way back.

That is all there really is to it.  I can certainly see applications for this either in bigger cities or those folks to tend to loose their car.  Though at $79.95, it is a bit spendy unless you really think you need it.  Then it could be priceless.  (Think cost of wandering around the parking garage in terms of $$ per hour )