3) The distance from a new point to a known point is extremely short or extremely long.
4) A new point (station point) and three or more known points are arranged on the same circumference. See above Fig. 2.
When searching for a new point by free stationing and surveying by installing an instrument in the point, accuracy may not be stabilized compared with the case where an instrument is installed on a known point. In field work which needs a high-precision survey, we cannot recommend this method.