ɪn ˈæktʃuːəl pɹˈæktɪs, ˈiːðɚɹ ʌv ðiːz vˈaɪɾəl fˈæktɚz kæn biː ɪŋkɚɹˈɛktli mˈɛʒɚd ɔːɹ ɡˈɛst æt, kˈɔːzɪŋ mˈɛni ˈɪʃuːz ɪnðə dɪvˈaɪsᵻz ɐbˈɪləɾi tə tɹɐvˈɜːs ðə tɚɹˈeɪn.
In actual practice, either of these vital factors can be incorrectly measured or guessed at, causing many issues in the device's ability to traverse the terrain.