[topher]

What SURTASS LFA works (as an active sonar) is different from a dipping active sonar.

One way to do a dipping Active Sonar is to use a blimp (as in the Goodyear Blimp).

SURTASS must go at slow speeds to find stuff...

A Blimp might be able to go up to 40+ knots and then maintain a position to dip the sonar.

In point of fact, blimps were used in WWII to find German/Japanese Submarines (though mainly German U-boats).

Currently platforms that may provide Active Dipping Sonar are limited by weight and time over the area to hunt the sub... (Helicopters or V-22 Osprey).

[stuartcr]

Yes I know, but these ships are not designed to dip sonar, LFA is the closest they have.