Path Profile Line of Sight Analysis. Access the Line of Sight analysis by pressing the Line of Sight... button at the top of the path profile window, or by selecting the option from the Path Profile Calculate menu.. This brings up the Setup Line of Sight/Earth Curvature dialog (pictured below), which allows the user to configure a line of sight calculation along the selected path. For a tru e line of sight, such as used for optical search and rescue, the constant in the equations changes from 1.23 to 1.06. A nomograph for determining maximum target rang e is depicted in Fig ure 2. Although an aircraft is shown to the left, it could just as well be a ship, with radars on a mast of height "h". Any target of.