[ColonelSandersLite]

1: Yes, traffic is bidirectional.
2: In that test, it was between 8 and 10 knots inclusive. The final test will be from 5 to 25 knots inclusive and will report details based on target speed.
3: I measured the detection radiuses directly in TMO. All measurements where made with the default crew skill in a single mission, clear visibility, wind speed 5 knots. Of the targets I tried (I didn't try all of them) heito maru was the hardest to detect on radar by a small margin (a few tenths of a mile or so) so it is the target I used. All numbers where measured from AOB 0. Values:

        subSensors[0] = new SubSensor("Radar, SJ-1",      13.5);
        subSensors[1] = new SubSensor("Radar, SJ",         9.3);
        subSensors[2] = new SubSensor("Hydrophone, JP",    8.6);
        subSensors[3] = new SubSensor("Visual, Day",       5.6);
        subSensors[4] = new SubSensor("Hydrophone, WCA",   5.3);
        subSensors[5] = new SubSensor("Visual, Night",     3.575);
        subSensors[6] = new SubSensor("Periscope, Day",    3.3);
        subSensors[7] = new SubSensor("Periscope, Night",  2.05);

I'll put the source up in a couple of days, after I have had time to fine tune and clean it, should you want to look through it.