text: Chapter 6
  STEP 4--PACE OFF THE DRIFT IN METERS INTO THE WIND
  6-93. This should be the reciprocal heading of the PIBAL direction. If a PIBAL was not used, then a
  field-expedient means of determining wind direction may be used. If the direction and distance of the drift
  are paced into the wood line, the PI is adjusted as necessary, but only forward, left, or right.
  Example: 90 knots drop speed = 45 meters forward throw.
  GROUND-MARKED RELEASE SYSTEM
  6-94. The GMRS offers the DZSTL a way to identify the release point to the drop aircraft without using
  a radio. The pilot uses the ground markings to adjust his flight path 100 meters to the right of the corner
  panel or light, and parallel to the approach-corner panel or light axis. (This discussion uses the words
  “panel” and “light” interchangeably.)
  PATTERNS
  6-95. Use VS-17 panels to mark the DZ with an inverted “L,” “H,” or “T” pattern. The selected pattern
  must be coordinated far in advance.
  Inverted “L
  6-96. The inverted “L” has four panels:
  y The approach panel.
  y The corner panel.
  y The alignment panel.
  y The flanker panel.
  “H” and “T"
  6-97. Align these other panels with and orient them on the corner panel. Due to side-angle-vision
  limitations in the C-5, use the seven-panel “H” and six-panel “T” patterns.
  VS-17 PANELS
  6-98. Figure 6-9 shows panel emplacement for “H” and “T” patterns (add an inverted “L” figure).
  Distances and azimuths are measured from the upper right corner of each panel to the upper right corner of
  the next, and from center mass of the selected RP. During daylight airdrops, the marker panels should be
  raised at a 45-degree angle from the ground toward the aircraft approach path to increase the aircrew and
  jumpmaster's ability to see them.