When Dragonfly is used with a monocular camera inside an un-mapped venue there is a drift accumulated over time. It is difficult to provide an accurate estimate of the accuracy in this situation because it really depends on the amount of objects (and thus features), on the motion of the camera, on the quality of the camera calibration etc… What we can say is that, in the conditions described above, the drift accumulated could be high enough to NOT recommend relying on the position provided after a minute of navigation. This is why in this situation it is mandatory to perform a pre-mapping of the entire environment with frequent loop closures (more info inside this page).