Sonar bottom reacquisition systems and methods

A system comprising:

• a sonar transducer assembly including a housing adapted to be mounted to a mobile structure;
• a sonar transducer disposed within the housing;
• and
• a logic device configured to communicate with the sonar transducer, wherein the logic device is configured to:
• receive and process sonar data provided by the sonar transducer, the sonar data including data associated with a depth of a bottom surface in an underwater environment;
• establish a bottom lock at the depth of the bottom surface based on the sonar data provided by the sonar transducer;
• detect bottom lock loss of the bottom surface in the sonar data provided by the sonar transducer, based at least in part on a determination that the sonar data provided by the sonar transducer lacks acoustic returns corresponding to a bottom lock depth associated with the bottom lock;
• determine a position of the mobile structure and/or of the sonar transducer;
• determine an expected bottom depth associated with the detected bottom lock loss based at least in part on the determined position and bathymetric chart data of an area underlying at least the determined position;
• and
• generate updated sonar data based, at least in part, on the expected bottom depth;
• wherein the generating the updated sonar data comprises:
• transmitting a sonar signal via the sonar transducer;
• and
• monitoring a sounding acquisition time period for acoustic returns corresponding to the determined expected bottom depth, wherein the sounding acquisition time period is based, at least in part, on the expected bottom depth.