dive compass
compass lubber line
A compass is used for underwater and topside navigation. Your instructor will teach you how to navigate with a compass during your open water dives.

Compasses must be held level to provide an accurate reading. The best compasses are filled with water, which dampens needle movement and prevents the compass from breaking under the pressure encountered under water.

Lubber Line
The lubber line is a fixed reference mark that indicates your direction of travel. Always hold the compass with the lubber line pointing towards the direction you're traveling to ensure the accuracy of your heading.