A data processing device system may be configured to cause display of a three-dimensional graphical representation of a first volume within a bodily cavity, cause the three-dimensional graphical representation to be annotated to include a graphical annotation set, and cause, at least in response to the annotation, the three-dimensional graphical representation to add an anatomical feature graphical representation. A data processing device system may be configured cause display of a particular graphical representation including a graphical representation of a particular volume within a cardiac cavity, cause the particular graphical representation to be annotated to include a graphical annotation set having a particular graphical attribute set, and cause, in response to a movement of a medical device, a changing of the particular graphical attribute set while the graphical annotation set graphically remains in correspondence with a same location in real-world three-dimensional space.