SUBCOURSE EDITION - Modern Prepper

Steps in plotting projection sheet corners (fig 4-1):Step 1: Determine from DA Form 1941 the grid square in which each projection corner falls. Sinceyou already know how to read grid coordinates, and you have learned how to interpret the DA Form1941 in the last lesson, this should be simple. For illustration purposes we will use the northwest corneras an example. First, determine the grid values of the first full grid lines on DA Form 1941 for thenorthwest corner. Then locate the same two grid lines on the grid (fig 4-2).Figure 4-2. Northwest portion of grid.Step 2:Plotting projection corners:a. Extract from DA Form 1941 the centimeter measurements for each corner.b. Set the precise measurements on dividers using the invar scale.c. Plot measurements from the correct grid line in the direction indicated by the arrows on DAForm 1941.d. Again, you will use the northwest corner as an example. The NW projection corner is shownin figure 4-3 with information taken from DA Form 1941. Figure 4-4 is an interpretation of how thedimension arrows relate to this particular projection corner. In order to plot this or any projection69