Yes, there's bug in 1.01. Will be fixed in retail version and patch, the new demo 1.02 has active sonar fixed already. But still the return can be usually heard before something can be seen on the display, it's probably something similar like narrowband lines visible where there is nothing on broadband yet. Common sense says it should be reversed (i.e. blip on the screen visible first) but real world sonar operators says it happens in real world, that you hear the return with nothing on screen... strange but if so then maybe it's realistic...
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