A dive compass is a navigational tool used to determine direction underwater. It is essential for navigating while diving, especially in low visibility or unfamiliar environments. Dive compasses typically feature a rotating bezel with degree markings and a magnetic needle that aligns with the Earth's magnetic field. Proper use involves understanding compass headings and adjusting for underwater currents. A dive compass should be rugged and easy to read in various underwater conditions, and divers need to practice using it to ensure effective navigation.