There are not exact formulae to apply for the effects of wind and determining a lead point.
Just be aware of how wind will affect your aircraft movement when turning on an arc and decide
which method will be your course of action.
When entering an arc from a radial while tracking inbound the same general rules apply (Figures
4A, 4B, 4C).
In the cases pictured above, we entered an arc from a radial. When a radial crosses an arc, a
90º angle is formed. Therefore, the heading on which you choose to enter an arc should differ
90º from the heading you maintained on the radial (Figure 5),
4-4 TACAN ARCING