Best is doing something like Z letter .. more then 90 degrees turns .. and time between legs has to be enough for several lines. Also add some time to TA to turn too, because it takes some time .. for this reason it is good idea to have it extended from about one third, so it does not lag that much. You mostly do TMA legs when you only have the contact on TA, so this is important.
If you have the contact on other arrays too, try to extend TA as much as possible, it will allow you to triangulate from two arrays and you get quite good range estimate without full TMA.
Full Z is optimal .. to move target from one side of the boat to the other side is usually enough .. sometimes even slight course changes allows you do TMA quite right.
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