Sonar Accuracy in SHIV
It is a simple model and you are correct that it is a modeled layer depth which aids in evasion and detection. More of a model and the game would bog down. Even today we have extreme difficulty accurately modeling what sound does especially in shallow water and it has been my professional experience that even with the newer models and computers online for shipboard use they generally are good for sound paths but are horrendous at propagation loss. BTW I am also a Sonar Tech by trade 24 years worth.
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