Patent ID: 8816864

Claim:
A system for locating an animal comprising: at least one Animal Receive/Transmit Unit (ARTU) operative to receive/transmit data; and at least one Coarse Base Station (CBS) operative to receive/transmit said data from/to said ARTU; said system having at least two modes of operation: a rest mode and an operating mode; said operating mode is characterized by said ARTU receiving data and transmitting data; said rest mode is characterized by at least three phases: a coma phase, a synch phase and a cadet phase; wherein, in said coma phase, said ARTU is incapable of receiving data and is incapable of transmitting data; wherein said ARTU is in said coma phase for a first predetermined period of time, such that said ARTU is transformable from said coma phase after said first predetermined period of time; further wherein, during said synch phase, said ARTU performs at least one of a group consisting of: establishes time points for entry into the next said cadet phase, and is ordered by the CBS to become alert or operative.