This John Deere GreenStar Combine Yield Mapping System Operator's Manual OMPC20003 J7 is a must-have for anyone who wants to get the most out of their combine. The manual covers all aspects of the system, from how to use it to how to interpret the data it provides. It is specifically designed for use with John Deere combines and is an essential resource for anyone who wants to optimize their farming practices. The manual is in electronic format and is compatible with a wide range of devices, making it easy to access and use.