The SOL Whistle Compass combines a liquid filled compass with a high decibel whistle for a lightweight safety and navigation tool. The 1.25 in. liquid filled compass with dual-colored magnetic needle is easy to read. Use the whistle in an emergency to signal for help. Weighing a mere half an ounce, wear around your neck or attach to your gear with the included breakaway lanyard. Intended for use in the northern hemisphere.