I can tell you what I am doing. It may or may not be the right way but its the only way I know. I grew up on a farm and spraying the field to kill the bugs, with the tractor I know the problem you have with getting off course and missing large amount of areas. When you search an area you want to make sure you have covered every square area. Imagine spending months covering an area but because your gps was off the 20 ft. and the area that you missed contained the goodies you were looking for. Its murphy's law that this would happen. I do know that to be accurate with the GPS you need to have another reference point. that transmits a signal just like the satellites do. This is the way they do it to be within an inch when they do surveying. Im still researching it for something that is affordable.
What I am doing is using my laptop with a topo map program. You can hookup your gps to your laptop that has the topo map program. You can do a bread crumb trail to know where you have been. This is a crude method but its the one I am going to start with until i come up with something better. I use this now when i look for areas. the curser on the computer always tells me where Im out. It works great.
A far as pulling a cart with plastic wheels or using 2"PVC pipe that acts as a sleigh I have a better ingenious way. Plastic wheels will be a maintance nightmare and PVC pipe as a sleigh will give you false signals as you go up and down hitting rocks, sagebrush etc. Its called a Picavet system. Google it to know what it is. With a long pvc pipe hung out like a fishing rod with the loop tied to the picavet system your loop will always be stabilized no matter if your four wheeler is sideways or if there is sagebrush, rocks. it will be suspended above the ground. in a level position all the time...
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