Coding, an important basis of modern information science, is broadly applied to surveying instruments. This paper deeply discusses its applications in electronic level, electronic transit and GPS.

Through the analysis on every procedure of surveying 1:500 topographic map with the method of transit mapping, the position error of 1:500 topographic map is got.

This paper gives a brief description of various kinds of facilities, reconnaissance and surveying, and design of transit marks of a swinging ground for magnetic compass adjustment.