To determine if you can use the Iowa version of SNMP with your operation, refer to this map of Iowa . The Missouri version is currently the only one that includes an example operation. If you want to look at a sample operation before laying out your own operation, download and install the Missouri version. Be sure to install it in a different folder than your state's version. Obtain the DOQs for your operation.
Most counties encompass several quadrangles.
Each quadrangle is divided into four quadrants or quarters. You will need to obtain one or more DOQ for your operation. In Missouri, you can go to the University of Missouri Map Room Web site and use the Interactive Maps applet to cut out just the piece of the DOQs that you need. This piece will be much smaller and easier to download than one or more entire DOQs. In other states, you can order the DOQs from USGS for a nominal fee.