Abstract: Disclosed is a method for signaling the presence of a potential obstacle, such as a pedestrian (P) to a vehicle driver (V), in particular a machine driver, wherein each obstacle (P) is provided with a transmitter (Em) capable of outputting a presence signal of the obstacle, and including two at least substantially orthogonal transmitting antennas (A1, A2) and power supply device (1-5) suitable for outputting in-phase quadrature signals to the antennas, and each vehicle (V) is provided with a receiver (Re) including two at least substantially orthogonal receiving antennas (Ax, Ay).

Abstract: The hunting of game, such as squirrels, is facilitated by the simultaneous steps of simulating a distress cry of a young squirrel and the sounds which would be created by a predator in attacking a young squirrel. The simulated distress cry and sounds of the attacking predator cause inactive mature squirrels to become active and to give an indication of their location, such that they can be hunted effectively during all daylight hours. The distress cry is simulated using a novel game calling device in the form of a whistle and the predator sounds may be simulated by beating the ground with portions of flexible branches of an adjacent bush.