This multi-functional declination compass is an essential item for any hiker and belongs in every survival bag. It is lightweight and durable made of a clear acrylic plastic with a solid plastic cover that clips down and makes the compass waterproof. With both an adjustable declination dial to locate true north and properly navigate over long distances and a clinometer dial, you can use this compass to tell heights, distances, steepness of hills and even angle of the sun in the sky for time.