500
Hang bright flag on tree; universal distress signal (3 shouts, 3 whistles or 3 gunshots); sweep horizon with mirror or metal; send SOS call (3short signals then 3 long signals then 3 short signals) using flashlight, whistle, or 2 way radio; large SOS made in sand or snow; and mountain climbers' signal of distress (both arms raised and crossing them).
What are five ways to signal for help when lost at camp?