A method and apparatus which enables an individual user to determine corners and other points of interest in a construction site layout. Basic trigonometric calculations are made based on a dimensioned drawing which enables corners or other points of interest to be located by measurement to a plurality of known locations which preferably lie away from the working are of the construction site. The worker or workers then take these measurements to the site and measures the calculated distances from the know locations to determine the location of the points of interest.