7. A geophysical survey licensee who uses explosives as an energy source shall:(1) show on the location map referred to in subparagraph 2 of section 2 the exact location of all boundary markers on the area covered by the licence for geophysical surveying;
(2) before the geophysical equipment traverses the land, indicate by means of posts not less than 1 m in height every boundary marker within a 50 m radius of the location of a shotpoint.