[skookum]

I've successfully attacked convoys in poor visibility using the hydrophone and some intel. If I get a contact report on a convoy, I plot my intercept as usual to arrive about 30 miles ahead of the group. I do my best to line up with my bow 90 degrees to the convoy's predicted course and about 2000 meters off the center line. With the periscope pointed at zero degrees I input the convoy's predicted speed and AOB (90 degrees) into the TDC and then switch to auto TDC. Then I set my torpedo gyro angle to zero by turning the periscope to the appropriate bearing. I make a note of that bearing and plot it on the map from my boat's position. I simply launch a fish or two each time a hydrophone contact line crosses the bearing line. Because the gyro angle is zero the range to the target is irrelevant and I get a hit more often than not. It's impossible to perform the surgical precision that one can achieve with a visible target, I often have no idea what ships I hit until they show up in my patrol log, and I rarely get to watch my prey go down. But it certainly makes foggy days less bleak. It's pretty exciting watching the stopwatch count off the seconds to impact.