The present invention is directed to utilizing monitoring devices (200) for determining the effectiveness of various locations, such as media display locations (150) for an intended purpose (media display exposure). The monitoring devices (200) are distributed to a number of study respondents. The monitoring...http://www.google.es/patents/US6970131?utm_source=gb-gplus-sharePatente US6970131 - Satellite positioning system enabled media measurement system and method
Satellite positioning system enabled media measurement system and method
