To those who believe that people are incapable of making anything other than simple circles, there have grown up a number of myths that are wholly incorrect.
GPS and Night Vision – People who make crop circles do not use any of this equipment. Firstly it is not required. When out in a field at night, it is surprising how quickly your eyes adjust and on average can see around 15-20 metres. You don’t need to see across the entire formation/circle. You only need to be able to see the area you are working on. Couple that with the fact that you will have a detailed plan, night vision is not required. GPS is also pointless. A GPS system will only tell you where you are on the planet. So to use a GPS when making a circle you would need to know exactly all the co-ordinates of every aspect of the crop circle. This means you would have to map it out before hand. All so unnecesary when a surveyors tape, a stomping board, a good plan and sometimes a laser-light will suffice.
It is exceptionally rare for circlemakers to get caught or interrupted. It has happened a few times, but contrast that with the numbers of circles that get created and the odds of getting caughts are extremely small. Circle makers will scout out before hand their target field and it is done very late at night. Just think about this, the infamous East Field which hosts many of the most famous crop circles, is the most watched field probably in the world and yet under the noses of skywatchers and researchers, formations appear with no-one getting caught. This has happened in many fields which were supposedly being watched.