Put silent running.... go to map, and look the info of the sonar crew, the red lines, attempt to maintain them as at bak as posible, do not make zig zag .... because it reduce you average 'going out' speed.
The average search pattern advace speed of DDs is just similar to your max silent running speed, if you make zig zags, you will never go out of they serch pattern.
Attempt always to make an "Y" with the red lines at your back.
Zoom in, look the red lines, when one of them become short, it is your crew is informing it is more near than the others, prepare to make a course change, 30 to 45 degrees, so to disturb the depth charges launch.
After depth charge launch..... recover the course to make a new time the "Y" with the sonar contacts red lines.
If you are against a single DD. after DD pass you will be ion the DDs sensors shadow zone, you can put ahead flank, and go following the DD, and when it turns yo can make a 90 degree turn, and put silent running another time..... he will go to search for you at the wrong place.
Be ware with it, not stay too much time at ahead flank afetr the DD intiate the turn.... you will enter a new time into the DDs sensors zone.
High depths may help a lot...but be ware, if you are hevy damaged so deep, you are done.
You must to take the risk..... and found a balance, depth helps to avoid detection, but may be lethal if you are damaged seriously.
This works fine for me.
