A impact detection system is provided which includes a user interface comprising a display, processor, and memory. The memory includes computer program code configured to cause an electronic device to receive impact detection data from at least one impact detection device and generate one or more notifications based on the impact detection data.

Various implementations described herein are directed to a computer-implemented method for tracking one or more targets on a sonar image. The method may include displaying the sonar image on a computer screen, receiving a command to track the one or more targets on the sonar image, storing the locations of the one or more targets relative to a vessel and displaying a symbol around a respective one of the one or more targets.

Various techniques are described that relate to the manner in which marine devices may generate and display a water depth contour map while navigating a body of water. The contour map includes contour lines associated with determined contour line data that indicate geolocations of underwater terrain existing at depths of the body of water specified by the contour lines. A boundary enclosing a region of interest for the body of water may be determined and the contour map may include contour lines determined using the determined contour line data within the region of interest. The boundary may correspond to a natural shoreline along the perimeter of a body of water or a portion of the body of the water. The boundary corresponding to a shoreline may be automatically identified based on a stored map by identifying geographic locations along the perimeter of the body of water.

Various implementations described herein are directed to a non-transitory computer readable medium having stored thereon computer-executable instructions which, when executed by a computer, may cause the computer to receive sonar data from a transducer after deployment of the transducer in a body of water. The computer may process the sonar data to detect a bottom of the body of water based on the sonar data received from the transducer. The computer may automatically trigger at least one event upon detecting the bottom of the body of water.

Techniques are disclosed for systems and methods to provide transmission signal shaping for transmission signal-based sensor systems, such as radar and/or sonar sensor systems. A low noise signal shaping transmitter includes a digital to analog converter configured to convert a digital shaping control signal to an analog shaping control signal, a signal shaping circuit configured to convert the analog shaping control signal into a shaped voltage, and a power amplifier configured to provide a shaped transmission signal based on the shaped voltage and a digital transmission control signal. Each element of the transmitter may be formed from relatively slow switching analog and/or digital circuitry components. Resulting shaped transmission signals may be used to excite radar antennas, sonar transducers, sound cells, and/or other elements of sensor systems.

Various implementations described herein are directed to a device having a housing configured for mounting to a watercraft. The device may include a power interface configured to receive power from a power source. The device may include a network interface configured to receive marine data from a plurality of different data sources. The device may include a sonar interface configured to receive sonar data from a sonar device. The device may include a display interface coupled to the power interface, the network interface, and the sonar interface. The display interface may be configured to receive power from the power interface, receive marine data from the network interface, receive sonar data from the sonar interface, and provide power, marine data, and sonar data to a remote marine display that is separate from the device.

Techniques are disclosed for systems and methods to provide accurate and reliable compact sonar systems for mobile structures. A sonar system includes multiple sensor channels, each comprising a sonar transmitter and a sonar receiver, and a logic device configured to provide control signals and receive sensor signals from the sensor channels. The logic device is configured to provide transmission signals to sonar transducer assemblies, where signal patterns of the transmission signals are differentiated based at least in part on frequency content. Acoustic returns are processed using the signal patterns to reduce inter-channel pickup between the sensor channels. Resulting sonar data and/or imagery may be displayed to a user and/or used to adjust a steering actuator, a propulsion system thrust, and/or other operational systems of the mobile structure.

Various implementations described herein are directed to a non-transitory computer readable medium having stored thereon computer-executable instructions which, when executed by a computer, may cause the computer to sense deployment of a transducer in water based on receiving sonar data from the transducer. The computer may automatically trigger at least one event upon receiving the sonar data. The at least one event may include recording the sonar data generated by the transducer.

Various implementations described herein are directed to a transducer array. The transducer array may include a first receiver having a first aperture width. The transducer array may include a second receiver having a second aperture width that is substantially equal to the first aperture width. The transducer array may also include a transceiver having a third aperture width that is larger than the first aperture width and the second aperture width.

Multiplexed phased array sonar systems and methods for consumer fishfinders are described herein. A transducer unit for such a system includes a transmit (TX) element that generates a sonar ping, a receive (RX) array configured to receive sonar echoes resulting from the sonar ping contacting targets, a digital signal processor (DSP) that processes the sonar echoes into sonar display information, and multiplexers (MUXs) coupled between the RX array and the DSP. The MUXs are configured to couple a portion of the RX array to the DSP during a first time and a second portion of the RX array during a second time such that the of MUXs couple an entirety of the RX array to the DSP during each transmit-receive cycle. A method of preventing distortions in the sonar display information selects the elements of the RX array to be sampled in accordance with a predetermined multiplexing pattern.