The author did not agree with NAVICO
there is SonarWiz which works with 3D data for several thousand.
And there are Russian developers who made a converter for LSS3D data.
mega.nz/file/YdA1DJCS#C9bdX99RtxmtkXLJCm...9zwjYtOPFuI0mJqemiQY
BUT! because Lowrance equipment is very primitive and does not even have a built-in dynamic displacement sensor in the transducer. Recorded data in raw form is very distorted due to pitching and vertical movements.
Solved by recording pitch data from an electronic compass, point-1, converting the data into post-processing software such as SonarWiz, Hypack.
All this is nonsense! Easier to buy Chinese multibeam echo sounder Hydro-Tech