Patent ID: 8126535

Claim:
A marker navigation system for detecting and displaying locations of at least two reference devices, each reference device attachable to a corresponding object, comprising: a detection device for detecting signals emitted from or reflected by the at least two reference devices; a display device for displaying, based in accordance with display signals, the locations of the at least two reference devices and/or the objects attached to the at least two reference devices; and a data processing device configured to a) calculate the locations of the at least two reference devices based on the detected signals; b) determine changes in the locations of the at least two reference devices based on the calculated locations; c) check, based on the determined changes, whether the determined changes in the locations of the at least two reference devices can be described by a same checking transformation that, to a predetermined extent, transforms the locations of the at least two reference devices before the change into the locations of the at least two reference devices after the change; and d) determine the display signals for displaying the locations of the at least two reference devices and/or of objects attached to the at least two reference devices as a function of the checking result.