The bad news is that the escorts have radar.
The good news is that you have radar detectors, and you can detect them long before they can detect you.
What you want to do is shadow the convoy at a range just enough to detect their radar signals. This is probably between 10K and 16K meters. You will need to enable the 16K mod. Shadow them on the surface long enough to chart their course and speed. Draw a line from the center of the convoy out along its predicted course.
Go to flank speed and plot an "end-around" course, parallel to the target course and then cut over to intercept. After you are at flank speed, note the time to end of course. Should be like 2 hours.
Use the manometer on the side of your map - draw a line from the known speed of the convoy through 120 minutes. Then note on the distance line how far the convoy will have moved in 120 minutes.
Draw a circle centered on the current convoy position of radius equal to the distance computed above.
Where the circle and the convoy course line intersect is where you should end up at the end of your intercept. If necessary, adjust your course and re-compute the convoy end position until you get a good intercept. You will want to make your intercept happen about 10K m in front of the convoy - it does you no good to intercept directly at the convoy.
As you approach your intercept position, you should start to detect the convoy escort's radar again. Verify that they are coming down the predicted course and have not changed course.
If all is well, submerge and go silent. You should be ahead of the convoy and off to the side. Ideally you should be about 3000 meters or so off to the side of the convoy's course.
Then just sit and wait for the convoy to approach. When they get within visual you can pop up your scope for quick looks to refine their course. Don't keep the scope up long.
With luck, you should be able to sneak in beside the leading escort and in front of the flank escort. If you are really good you can get within the convoy undetected.
Fire your torpedoes and head for the deep.
First rule of late-war convoy attack: Never attack a convoy without 100% hull integrity. You will need to go as absolutely deep as your sub can go to have any hope of evading the escorts after the fireworks start.
Steve
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