Abstract: A dispenser for dispensing and attaching individual markers to a reference array of a tracking system is described. A housing defines a cavity extending along a longitudinal axis. The housing has a dispensing end defining a dispensing aperture. A plurality of markers are stacked within the cavity. Each marker has a marker attachment feature by which the marker is attachable to an attachment site of a reference array. The dispensing end of the housing provides a retainer which exerts a retaining force on a bottom most marker sufficient to retain the plurality of markers within the cavity but permitting the bottom most marker to be released from the cavity when the bottom most marker has been attached by its attachment feature to the attachment site of the reference array.