Figure 20 - P-8010115

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Figure 20
Continuing with our previous example, if we had commenced a ground speed check at our start
point, the 105°R/40 DME, and 3 minutes later we found ourselves at the 078°R/38 DME
(position number 2), our track would have been that of the dotted line. Our distance covered, the
actual length of that line, is 18 NM. Since our G/S check was for 3 minutes, we have covered 6
nm/Min, or 360 Kts G/S. Since our TAS is 420, we have a headwind component of 60 Kts.
To determine a G/S utilizing the pencil method, we employ a similar principle by connecting
the start point of our ground speed check to the stop point. Now compare the distance which
you have noted by the length of the pencil segment, to the radius of the BDHI. If you have done
it carefully, the proportion you determine should come out to 18 NM (Figure 21)
TACAN POINT-TO-POINT 5-17

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