Field Expedient Direction Finding

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Field Expedient Direction Finding

• Developed by the
• National Emergency Services Academy

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Objectives

• Learn various methods to determine direction
  without the use of a compass
• Stick and shadow method
• Watch method
• Sun
• Stars
• Natural

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Stick and Shadow

• The sun rises in the east and sets in the west-
  but not quite
• Rarely does the sun rise directly in the those
  directions (90 or 270 degrees)
• You can still use the shadow tip method to
  determine direction
• Start by finding a stick you can drive in or prop
  up on the ground.

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Shadow Tip Continued

• Place a stick or branch in the ground at a level
  spot where a distinctive shadow will be cast.

1. Mark the shadow tip with a stone, twig, or other
   means. This first shadow mark is always west.

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Shadow Tip Continued

• Wait 10 to 15 minutes until the shadow tip moves
  a few inches. Mark the new position of the shadow
  tip in the same way as the first.

• This second shadow mark is always east. Draw a
  straight line through the two shadow- tip marks
  to obtain an approximate west- east line.

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Shadow Tip Continued

• Now, to determine your north- south line,
  stand with the first mark (west) to your left.
  The other directions are north to the front, east
  to the right, and south behind you.

Remember- the stick must be vertical in the
ground.
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Tell time with your shadow?
The west part of the east-west line is 0600 hours
and the east part is 1800 hours. The north-south
line becomes noon and the shadow of the stick
becomes the hour hand.
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Shadow Tip Continued

• Accuracy varies depending on latitude and time of
  day
• Early morning and late evening are the least
  accurate Close to noon is the most accurate
• The closer you are to the equator- the more
  accurate
• If readings are taken throughout the day, errors
  tend to cancel each other out

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Watch Method

• Must have a non-digital watch
• Not as accurate as shadow stick method

• In the northern hemisphere
• Hold the watch with the hour hand pointing to the
  sun
• Imagine a line running through the 12 and true
  south is midway between the hour hand and the 12.

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Star Method
At night, you can find north by locating the
North Star, Polaris. First, find the big dipper.
The last two stars of the dippers cup point
directly at Polaris about 5 times the distance
between those two stars. Facing Polaris, you are
looking north with east on your right and west on
your left.
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Other Clues

• Not precise- and it takes practice, but
• Plants generally grow towards the sun
• Moss often grows on the side away from the sun or
  on the damper side of the tree but can be
  influenced by other factors
• Leaves on trees usually thicker on the sunny side
• The rings of a tree stump are usually closer
  together on the side closest to the poles

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Make Shift Compass

• A needle from a sewing kit can be fashioned into
  a makeshift compass

• Magnetize the needle by rubbing it with silk or a
  magnet
• Hang with a thread to let the needle point to
  magnetic north
• You could also float it on some cork or similar
  material

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• These presentations were made by the National
  Emergency Services Academy for the purpose of
  advancing, refreshing, or reviewing information
  for search and rescue training.
• Products shown are for illustration purposes
  only. The National Emergency Services Academy,
  Civil Air Patrol, or the United States Air Force
  does not endorse, guarantee, or recommend any
  specific company, service, business, or product.
• Presentations are designed to be used with
  qualified instructors familiar with your local
  area.

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QUESTIONS?
THINK SAFETY!