(2) Shadows. If no other means are available, you may have to construct mounds that will use the sun to cast shadows. These mounds should be constructed in one of the International Distress Patterns. Piled snow or snow blocks may be used to cast shadows. To be effective, these shadow signals must be oriented to the sun to produce the best shadows. In areas close to the equator, a North —South line gives a shadow anytime except noon. Areas further north or south of the equator require the use of East—West line or some point of the compass in between to give the best result.
(3) Size. The letters should be large as possible for a pilot or crew to spot.
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