The City Navigator concept was invented by two Dutchmen Erik Fransman and Kees de Voogd, and the development was supported by ESA's Business Incubation centre in ESTEC, The Netherlands. The idea is to provide an easy to use tool to help people move around in a city they do not know. Initially offered in Amsterdam, the City Navigator has since 2007 also been available in Barcelona, Spain. For more information, www.citynavigators.com and www.citynavigatorsbarcelona.com.