Abstract: A sonar display comprises a processing element and a display. The processing element is configured to receive a first sonar electronic signal from a first sonar transducer, receive a second sonar electronic signal from a second sonar transducer, generate data for a first underwater image stream from the first sonar electronic signal and a second underwater image stream from the second sonar electronic signal. The display is configured to show at least one of the first underwater image stream having a first view derived from reflections of a first sonar beam, the second underwater image stream having a second view derived from reflections of a second sonar beam, and an indication of a position of the first sonar beam relative to the second sonar beam.

Abstract: A sonar display comprises a processing element and a display. The processing element is configured to receive a first sonar electronic signal from a first sonar transducer, receive a second sonar electronic signal from a second sonar transducer, generate data for a first underwater image stream from the first sonar electronic signal and a second underwater image stream from the second sonar electronic signal. The display is configured to show at least one of the first underwater image stream having a first view derived from reflections of a first sonar beam, the second underwater image stream having a second view derived from reflections of a second sonar beam, and an indication of a position of the first sonar beam relative to the second sonar beam.

Abstract: A marine vessel control system operable to be used with a shallow water anchor and a motor. The marine vessel control system comprising a memory and a processor. The processor is configured to receive a user command to maintain a position of a marine vessel, receive sonar data, determine a water depth relative to a water bottom based on the sonar data in response to receiving the user command, and transmit a command to use the shallow water anchor and/or the motor based on the water depth.

Abstract: A device for controlling a cursor on an avionics display screen. The device has a grab handle conveniently located and shaped to be comfortably gripped. The handle is equipped with a trackball which can be turned by the thumb to move the cursor on the display. Alternatively or additionally, a trigger may be provided to effect a select function using the index finger. One or more switches may be provided on the handle to change the content on the display.