In a system and method of navigating an agricultural vehicle on a land area, at least part of the land area is imaged in real-time from above to provide a sequence of images showing the vehicle and at least one landmark. Positions of the vehicle on the land area are identified from the sequence of images by image processing, to provide vehicle data based on the identification of the positions of the vehicle. Furthermore, a position of the at least one landmark on the land area is identified from the sequence of images by image processing, to provide landmark data based on the identification of the position of the at least one landmark. A path of the vehicle across the land area is controlled based on the vehicle data and the landmark data.