A system for tracking a location of at least one item is described. The system includes a tag associated with the at least one item during a shipping journey. The tag detects shipping information, including temperature, humidity, shock, etc. The tag sends the shipping information to a master unit. The...http://www.google.com/patents/US7895131?utm_source=gb-gplus-sharePatent US7895131 - Cargo tracking apparatus, system and method
