Methods and apparatus for research data gathering with a portable monitor and a stationary device are described. An example method includes gathering, via a stationary monitoring system, first data concerning exposure to media output by a media receiver, wherein gathering the first data comprises collecting a first code encoded in the media, gathering second data concerning exposure to the media output by the media receiver with a portable monitor carried on the person of a user, wherein the second data comprises a second code encoded in the media, gathering, via the portable monitor, location data encoded in the media by the stationary monitoring system, the location data providing information on a physical location of the portable monitor, and producing the audience measurement data concerning exposure to the media output by the receiver from the first data, the second data, and the location data.