Self-locating remote monitoring systems

The system (750) includes a supervising base station (754) and remote monitoring unit(s) (752) including a navigational receiver (756) providing a remote unit location (759) and a transmitter (758) for communicating the location (759) to the base station (754) for display (772). The remote unit (752) includes sensor(s) (760) monitoring the remote location. A change in sensor status (761) results in the status and the location being transmitted to the base station (754), which includes alarms (776) and displays (772) responsive to the change in status. Various embodiments define a man-over-board system, an invisible fence system, and a weather surveillance system.