Northern Territory Numbered Regulations Northern Territory Numbered Regulations(1) The relevant person must erect a boundary marker at each corner of the survey area and in the angle of at least 2 trenches:
(a) that clearly indicate the direction of the boundary of the survey area; and
(b) each of which must be at least 1 m in length and 150 mm in width and depth.
(2) However, if it is impracticable to cut trenches because of the nature of the ground, the relevant person must place a row of stones, at least 1 m in length and 150 mm in width and height, to indicate the boundary.
(3) In addition, if it is impracticable to erect a boundary marker at an actual corner of the survey area (for example, because of the presence of water), the relevant person must:
(a) instead, erect the boundary marker on the boundary line as near as possible to the corner; and
(b) mark the boundary marker with:
(i) the letters "W.P." (denoting "Witness Post"); and
(ii) the distance in metres to the corner; and
(iii) the direction to the corner.
(4) If the relevant person is surveying a survey area that has the same boundary corner as a related area of land, the relevant person may erect only one boundary marker at the corner.
(5) For subregulation (4), a related area of land is land for which the relevant person:
(a) has made, or is making, an application for the grant of a mineral title; or
(b) holds a mineral title; or
(c) holds an access authority.