| 摘要 |
A communications system for locating, tracking, and messaging between people, which preferably includes a satellite, global positioning satellites, ground monitoring units, and a portable-transmitter-receiver unit to locate and track objects and people. A communications satellite system can transmit and receive messages concerning the location and situation of an object or person. A location system may operate by way of global positioning satellites. The portable transmitter-receiver can activate a signal to the satellite system, which can inform the ground monitoring units that a person is in need of help. Each transmitter-receiver can contain memory that allows for identification of the wearer and can provide information such as address, medical problems, emergency contacts, etc.
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