From my experience:
- AFAIK, in DW, shallow water does not affect sound travel, except for terrain blocking the signal. But I guess it should block everything or nothing, it should not weaken the signal.
- Sea state on the other hand does lower sonar performance significantly. So what was your sea state ?
- Burke at 10kts, at 3nm should be nice and bright, impossible to miss (based on my DW experience alone). There IS something fishy here, that is NOT normal. What array did you use ? What speed were you going ? All arrays are easy to washout with excessive speed. In shallow water towed array is easy to get draged on the bottom. Please post screenshots from that situation, from map and from sonar station.
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