Harvest View app tracks activity in crop fields to gauge how well sections of the field are producing. The app is used by harvesters in the field and logs GPS points to track movement in the field. The app uses Bluetooth to detect trucks that are picking up loads from the harvester so once those truck loads are weighed, it is associated with that part of the field.

In combination with downloading the app, you will need to setup a polygon for each of your fields, assign BLE beacons to your trucks, and a way to weigh your truck loads.