1. A system comprising: (a) a feature matching circuit configured to determine a substantial correspondence between (x) a present-location landmark subsurface feature of a body part of an individual patient (hereafter “individual patient body part”), the present-location landmark subsurface feature having a first spatial relationship to a distal end portion of a body-insertable device deployed in the individual patient, and (y) a candidate reference landmark subsurface feature of the individual patient body part, the candidate reference landmark subsurface feature having a second spatial relationship to a particular selected target region of interest of the individual patient body part of at least two selected target regions of interest of the individual patient body part; (b) an event data circuit configured to generate data indicative of a proximity event, the proximity event including the distal end portion of the body-insertable device present at a location proximate to the particular selected target region of interest of the individual patient body part, the proximity event at least partially based on the determined substantial correspondence; (c) a list management circuit configured to add the proximity event to a proximity event list for the individual patient body part; (d) a computer-readable media configured to maintain informational data corresponding to the proximity event list for the individual patient body part; and (e) a communication circuit configured to output the informational data.