Ensuring that the alignment marks on the inner face of the circle are in line with those on the repeater on relative bearings of 000° and 090°

Aligning the relative bearing markings so that 000° is on the lubber's line and the line of sight passes over the center of the compass

Sighting a terrestrial range in line and comparing the observed bearing against the charted bearing

Comparing observed azimuths at different altitudes with computed values at the times of observation to see if the difference is constant