agopengps-official/AgOpenGPS ? reverse-engineered prompt

I want you to help me work on this AgOpenGPS project and get the current WinForms app building and running cleanly.

This is guidance software for agricultural use, with AgIO handling communication, NMEA position input, mapping, section control, and steering guidance like AB line, curves, contours, and headland turns. Please inspect the code, find anything broken, and make the smallest safe fixes so the app still works the way it already does.

Focus on bug fixes only, not new features or big refactors, since this project is in maintenance mode. If you need current docs or library details, look them up online. After making changes, make sure the solution still builds and explain briefly what you changed and why.