4 / 20

Given the following information, determine the difference in longitude between the position X and Y plotted on a Lambert chart...

Constant of the cone: 0.63
Initial track on point X: 292° (variation 28°W)
Initial track on point Y: 101° (variation 18°W)
Mean latitude: 44°41'N

For a Lambert conformal conic projection chart the following convergency formula is applied:

  • Convergency = Change of Longitude x Constant of Cone

Convergency expresses how much the Great Circle Track changes, because of the converging meridians and, in this case, it is: 292° - 281° = 11°.

Note: To determine the great circle track at Y, we need to determine the reciprocal of 281° (101° + 180°).

Thus, solving the convergency formula for Change of Longitude, we get:

  • Change of Longitude = Convergency / Constant of cone = 11° / 0.63 = 17.5°.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Austro Control
    2
  • Czech Republic
    1
  • Greece
    1
  • Sweden
    1
Keyboard Shortcut Use Keyboard Shortcuts