Abstract: The present invention relates to an apparatus and method for a proximity warning system that is designed for use in warehouses, wharves, factories, and other industrial sites. The invention provides a proximity warning apparatus for use in warehouses, wharves and other industrial sites, comprising, a first transmitting and receiving means arranged to be mounted to a first body and to a second transmitting and receiving means arranged to be mounted to a second body, wherein the first and second bodies are movable relative to one another, so that they may come into proximity with one another and, wherein the first transmitting and receiving means is arranged to transmit a electromagnetic signal to the second transmitting and receiving means and vice versa, to provide an indication when the first and second bodies are in proximity to each other, or to provide an indication when the second and first bodies are in proximity to each other respectively.