As long as you have radar, sonar is a waste of time and fuel. Radar has much longer range, gives you precise target positions, not just bearings and it works just fine at 4096x TC. You want to find more targets? STAY ON THE SURFACE AT ALL TIMES unless your live's in danger. The ostrich strategy doesn't work. You aren't safer just because you can't see and you don't see further with your radar antenna under water.
The number of targets you find is directly proportional to the number of square miles of ocean surface you search in 24 hours. That means you stay on the surface at 9 knots with the radar on. Anything else is dereliction of duty. Darn, I'm predictable!
