[danlisa]

Exert from the manual...

.....The next thing to think about is how you approach a convoy. You can’t just lay in wait and let the convoy run over you while hoping you won't be detected. Find the gap, watch the escorts, and watch their sweeps. After a patient bit of observation, you will see how the escorts will sweep and will likely find a gap. When you DO find that gap... go for it!......

Change the way you hunt.