From playing the Perry, the active sonar does washout with speed. You might still hear the "Ding" when a target gets painted, but it's impossible to tell where it is on the screen to be able to mark it. Sometimes you can hunt and peck to find it, but it's pretty tough even in searchlight mode.
Not sure if active washout affects AI platforms or not. They seem to ping away regardless of speed though (may just depend on the EMCON setting in the scenario), so still useful to do TMA on them.
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