Angular measurement of traverses

(1) A theodolite permitted by Regulation 31 (1) shall be used for EDM traverses with legs exceeding 2000 metres. (2) A theodolite permitted by Regulation 31 (2) shall be used for all other third and fourth order traverses. 22 Land Surveyors (3) At every traverse station of third order traverse, not less than four arcs shall be observed, each arc being on a different zero and consisting of two swings in opposite directions one swing being on face left and the other on face right: Provided that for a theodolite permitted by Regulation 31 (1) two arcs shall suffice. (4) At every traverse station of fourth order traverses not less than two arcs shall be observed: Provided that for a theodolite permitted by Regulation 31 (1) one arc shall suffice if the zero be changed between swings. (5) Angular measurements for subsidiary traverses may be made either with a theodolite or a compass of approved pattern subject to the necessity to achieve a standard of accuracy appropriate to the plotting scale of the plan of the survey. If a compass is used both forward and back observations must be made at each station. (6) It is not necessary to close rods of traverse observations on to reference station. CAP. 194.