text: Chapter 6
  M-2 LIGHT BATON
  6-50. Two BA-30s power this flashlight (NSN: 6230-00-926-4331). Different lenses (stored in the base
  compartment) change the color of the light. This light works best in a light hole or on top of the ground
  attached to a tent peg.
  AERIAL MARKER, DISTRESS
  6-51. This omnidirectional flashing (strobe) light (NSN 6230-00-67-5209) has a very long range. An
  optional directional cover snaps on top for tactical operations. Other snap-on caps change color and
  function. The black cap, for example, makes the strobe light invisible except to devices that can
  “see” infrared.
  MIRROR, EMERGENCY SIGNALING, TYPE II
  6-52. Pathfinders can use the signal mirror (NSN 6350-00-105-1252) to signal aircraft by reflected
  sunlight. The back of the mirror has a set of instructions for proper use and aiming. The signal mirror
  works even on hazy days. It works in all directions—not just when the user faces the sun—and the
  intended viewer can see it from as far away as the horizon.
  PILOT BALLOON
  6-53. Pathfinders use the 10- or 30-gram rubber balloon to measure the mean effective wind. They fill
  the balloon with helium until the balloon inflates to the specified circumference. National stock numbers
  for PIBALs follow:
  y NSN 6660-00-663-7933, balloon, meteorological, 10-gram.
  y NSN 6660-00-663-8159, balloon, meteorological, 30-gram.
  LIGHTING UNIT
  6-54. This light (NSN 6660-00-839-4927) attaches to the PIBAL for night operations. Overinflating the
  PIBAL compensates for the weight of the light so it can ascend at the same rate as it would without the
  light. Water or any other fluid will activate the PIBAL’s wet-cell battery. Below 50 degrees Fahrenheit,
  warm water activates the light faster. A 6-inch chem-light may be used as a lighting unit in place of the
  wet-cell battery.
  DRIFT SCALE
  6-55. This slide-type scale uses a 90-degree angle to measure the ascent of the PIBAL. Pathfinders use
  the drift scale to compute the mean effective wind. The local Training Support Center produces the drift
  scale. Pathfinders can also use the pocket transit (small enough to carry in a pocket), theodolite (NSN
  6675-00-861-7939) with built-in clinometer (NSN 6675-00-641-5735), or the separate clinometer
  (NSN 6675-01-313-9730).
  AN/PRC-119A (SINCGARS) RADIO
  6-56. This man-portable radio (NSN 5820-01-267-9482) allows FM radio contact with aircraft. It also
  permits navigational aid (NAVAID) for aircraft with FM-homing capabilities. Without power-increasing
  accessories, it transmits between 4 and 16 kilometers.