Multifunctional Outdoor High Transparency Portable Protractor With Map Survival Compass

Outdoor eco-friendly multifunctional high-transparency portable compass with ruler and map for survival Precautions: 1. Use it in a horizontal position to ensure maximum accuracy 2. To avoid magnetic needle misalignment, please keep a certain distance from wire mesh and objects containing magnets when using it; 3. Do not use a measuring ruler to knock on objects, as this may affect the accuracy of measurements; 4. The surface of the disc and the lens should be kept clean; do not use dirty cloths or your hands to wipe them 5. It should be closed when not in use and placed away from ferromagnetic materials to avoid loss of magnetism.、 How to use a compass: Make sure to hold the compass horizontally so that it can rotate freely.On the dial, w represents west, N represents north, E represents east, and S represents south.The red mark on the pointer indicates the N pole, and the white mark indicates the S pole.When using a compass, do not approach ferromagnetic objects, high-voltage lines, or electromagnetic devices, to avoid errors and reduce compass sensitivity