Abstract: A method for determining a threshold distance for a collision warning system includes receiving, from at least one sensing device, data indicative of a change of position of a target object relative to a host machine. The method further includes receiving data indicative of a velocity of the host machine and determining a closing rate associated with a rate of change of distance between the host machine and the target object based on the data indicative of a change of position of the target object relative to the host machine. The method also includes calculating a velocity of the target object based on the velocity of the host machine and the closing rate.

Abstract: A game wherein a plurality of bomber pieces with associated bombs are moved upon a game board in opposition against a plurality of missile pieces until either the last missile or last bomber is destroyed. The board game apparatus includes coding of the bombs to match the initial starting positions of particular missiles, and a plurality radar paths defining movement for the missiles which paths interconnect with a single branched flight path that defines movement for the bombers.