Date Added: Aug 2012
The authors propose m-courses (Monitoring Courses), a novel solution to localize events in an underwater wireless sensor network. These networks consist of surface gateways and relay nodes. GPS can localize the position of surface gateways which can then distribute their locations through the network using acoustic modems. Relay nodes are deployed to remain static, but these untethered nodes may drift due to water currents, resulting in disruption of communication links. They develop a novel underwater alarm system using a cyclic graph model. In the event of link failure, a series of alarm packets are broadcast in the network.