Van Effen Field (6Y4) is a public-use airport serving Rock, Michigan, at 970 feet above sea level, with CTAF 122.9. Its runways: 12/30 (2,600 × 100 ft, turf).
This diagram plots every runway from the FAA’s surveyed threshold coordinates, so it sits at true heading and true length — a gift for the pilots, students, instructors and families of 6Y4.