Abstract: Registering a robotic coordinate system defined by a robotic system and a navigation coordinate system defined by a tracking system localizer. The registration includes: determining a robotic coordinate system between a first portion of the robotic system and a subject separate from the first portion of the robotic system; connecting a fiducial marker at a first known position relative to the robotic coordinate system and relative to the first portion of the robotic system; acquiring a fiducial image at an initial time with an imaging system of the fiducial marker; detecting the acquisition of the fiducial image with the imaging system at the initial time with a detector; and sending a command to determine or record an initial position of at least one of the first portion of the robotic system or the robotic coordinate system at the initial time.