Originally Posted by eforce
To properly square the field without electronics, get three pieces of rope:
1. Length of field (~185ft if you want to leave room for refs/net)
2. Width of field (~135ft allowing for refs/net)
3. Diagonal from corner to corner. Use the C^2=A^2+B^2 method to calculate proper length.
Gridding out the layout:
1. Create a triangle with the ropes and use stakes to mark the corners, as well as each grid square along the sidelines. Repeat for opposite corner. Make sure the field runs North/South on the long axis to avoid teams getting an unfair advantage at sunrise/sunset.
2. Using your width rope, mark each grid square on the rope (take a sharpie and make a mark on the rope) and stretch it across the field from stake to stake.
3. Place bunkers within grid squares, move rope to next stake on the sideline, and repeat.
It's important to use the diagonal rope when establishing sidelines. This will force you to have a square field, assuming you can keep the ropes tight and straight when lining things up. If you only do length and width ropes, you can create an acute/obtuse angle in the corners which should be square.
I used a method very similar to this while helping a local field set up a psp field. This works very well and fairly quickly