| How can the accuracy of an azimuth circle be checked? |
| A) sighting a terrestrial range in line and comparing the observed bearing against the charted bearing |
| B) comparing observed azimuths at different altitudes with computed values at the times of observation to see if the difference is constant |
| C) 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° |
| D) 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 |
