A marker navigation device for determining and/or tracking a location of a marker device is provided. The marker device is attachable to an object, said marker device including a plurality of markers having known dimensions and being in a known positional relationship relative to each other. The marker navigation device includes: a detection device operative to detect signals emitted by or reflected from the plurality of markers, wherein the detection device is formed such that in first locations of the detection device relative to the marker device, detection of signals from one marker of the plurality of markers is restricted or impossible due to a location of another marker of the plurality of markers. In second locations of the detection device relative to the marker device, the plurality of markers are detectable by the detection device. The navigation device also includes a processing device communicatively coupled to the detection device and configured to calculate the first locations based on the relative locations of individual markers of the plurality of markers and based on the known dimensions of the plurality of markers, and calculate an actual location of the marker device relative to the detection device based on detected signals from at least one marker of the plurality of markers, the known locations of the plurality of markers relative to each other, and the known dimensions of the plurality of markers. The processing device also can determines whether the actual location of the marker device is one of the first locations. A warning device is communicatively coupled to the processing device and operative to output a warning signal when the actual relative location is one of the first relative locations.