To be honest it doesn't matter what point you pick as long as it looks like you have a realistic chance of getting to it before the target does. Even if it is miles ahead of them because you can always travel along their path to find them.
Use the sound check technique regularly to find them once you are one the target's pathas you can heard them before you will ever see them. Once you get a bearing on them you can then adjust speed and course for a close in intercept which is much easier to work out.
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