How many GPS users are there worldwide?
At least 45 million.
On March 16, 2009, market analyst firm Canalys reported 41 million standalone global positioning system (GPS) devices that were shipped worldwide in 2008. An Associated Press report appearing on CBS on January 21, 2010 states that in 2009, Canalys estimated global smartphone-based GPS usage at about 27 million. This places the world GPS user base at at least 68 million. The stated numbers only reflect consumer GPS usage, and do not include GPS users affiliated with government and scientific institutions.