A cardiac rhythm management system transmits event markers from an implantable device to a remote user interface such as an external programmer. The event markers include timestamp information. A printed/displayed event marker representation is aligned to a printed/displayed heart signal representation based at least in part on the timestamp information. Proper alignment of the printed/displayed heart signal representation to the printed/displayed event marker, and proper alignment of the printed/displayed event markers with respect to each other, provides more accurate diagnostic information to the caregiver. This assists the caregiver in using the cardiac rhythm management system to provide a patient with proper cardiac rhythm management therapy.