agopengps-official/agopengps ? reverse-engineered prompt

Build me a desktop app for agricultural guidance and section control, like AgOpenGPS.

I want a Windows app that can read NMEA GPS data, show the machine position on a map, and help a driver stay on AB lines, curves, and contour guidance. It should also handle section control for implements, with multiple sections that can be turned on and off to avoid overlap and over application. If possible, include the basic simulator mode too, so I can test without real hardware.

Make it feel like a real farm tool, with a clear map view, easy buttons for guidance and steering, and a way to track where work has already been done. Keep it focused on the current stable behavior, since this project is in maintenance mode, so I only want bug fixes and polish, not new features. If you need anything unclear, look up the current docs online first.