Patent ID: 7245899
Filing Date: 2007-07-17
Classification: A62B,G01S,G08B

Abstract:
1. A portable rescue device comprising: a first communication unit comprising a distress signal transmitter and a distress receiver, said receiver including a directional antenna structure comprising multiple antennas arranged so as to provide directional capability; a compass; a processor; a user interface; a mode switch for switching between at least a search mode and a distress signal mode; and a second communication unit, arranged to communicate with another rescue device set in the search mode, wherein said processor has a temporary disabling capability, wherein the portable rescue device, when in distress mode, at the reception of a disable signal is disabled and then automatically enabled again after a preset time, wherein each distress signal carries a device identification of the transmitting portable rescue device, and wherein the portable rescue device, in said search mode, thereby being a search device, is arranged to: receive a distress signal from another rescue device, which is in the distress signal mode; obtain at least two different bearings to said another rescue device, said bearings being taken at different search device positions; obtain information at least one distance between at least two of said different search device positions; use said at least two bearings and said at least one distance for calculating a current distance and a current bearing from the portable rescue device to said another rescue device; and communicate said current distance and current bearing to a user of the rescue device.