To ensure that you are using the ATV spreader efficiently, you will need to calibrate the spreader. This will ensure that you are using the correct amount of fertilizer or whatever materials it is that you want to spread. You will first need to make a quick calculation to determine the amount of material that you will need to cover 200 sq ft. This will then need to be added to your hopper. The second step is to measure the width of the area that needs to be covered and calculate the distance you will need to cover 200 sq ft. When you have finished check the hopper to see if there is any material left inside. If there is then you will need to increase the flow rate or decrease so you can cover the full distance needed.