1. A system for modeling a raw tracking curve of an in-vivo device passing through a colon, the system comprising: a data recorder unit to receive and store a plurality of in vivo signals sent from the in-vivo device passing through the colon; a processor to construct the raw tracking curve based on the strength of the received signals, said raw tracking curve representing estimated location of the in-vivo device; a colon section detector unit configured to identify milestone data on the raw tracking curve corresponding to defined locations in the colon and to translate the raw tracking curve to a modeled curve; and a monitor configured to display a graphical presentation of the modeled tracking curve.