This paper discusses two ground-watching navigation strategies for path-following control of a steered trailer at low speeds. Such systems provide navigation information by processing the features of the road surface in successive images. Theoretical performance of the systems was initially investigated in simulation. Field testing was conducted for three manoeuvres: a straight-line, a lane-change and a 90°corner. Test results show that both ground-watching navigation strategies are able to provide accurate off-tracking signals for path-following control.