How to Navigate With a Dive Compass: Headings, Squares, Kicks

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Why compass navigation still matters

Underwater visibility changes, reefs look similar from different angles, and a dive boat or shore exit can be hard to find. A compass gives you a way back when natural references run out. It's part of most advanced open water courses, and it's the core of navigation specialty courses.

This guide explains the core techniques. It's not a substitute for training: take a navigation course or practice with an instructor, and follow your agency's procedures. For gear, see our best dive compasses guide.

Parts of a dive compass

• Lubber line: the fixed line that points in your direction of travel.
• Bezel: the rotating ring with index marks, used to set a heading.
• Index marks: marks on the bezel you align with the needle or card.
• Card or needle: the magnetic part that points to magnetic north.
• Side window: lets you read the heading while holding the compass level in front of you.

Digital compasses on dive computers show the same information on screen, usually with a way to store a heading. See digital vs analog dive compass for the differences.

Step 1: Hold the compass correctly

This is the most important skill, and the most common source of error.

1. Wear the compass on the wrist opposite your dive computer and light if you can, to reduce magnetic interference.
2. Extend the compass arm straight ahead, and hold the forearm with your other hand, so the compass sits in line with your body's centerline.
3. Keep the compass level so the card or needle moves freely.
4. Point the lubber line in your direction of travel, along your centerline.
5. Look through the side window, or down onto the top, and keep the needle between the index marks as you swim.

If you're using a console compass, hold the console in front of you with both hands, level and in line with your body. It's harder to keep steady, which is why many instructors prefer wrist compasses.

Step 2: Set a heading

1. Point the lubber line at your target or in the direction you want to go.
2. Rotate the bezel until the index marks bracket the north end of the needle.
3. Swim, keeping the needle between the index marks.

On a digital compass, point the computer in the direction you want to go and press the button to store the heading. The display will show whether you're on course.

Step 3: The reciprocal heading (out and back)

The simplest navigation is out and back: swim out on one heading, turn around and swim back on the reciprocal.

Worked examples:

Most dive compasses have reciprocal marks on the bezel, so you don't need the math underwater. To turn around, swing your body until the needle sits in the reciprocal index marks, then swim.

Count kicks or time on the outbound leg, and use the same count to judge where to look for the start point on the way back.

Step 4: Square and triangle patterns

Patterns let you explore and return to your start without retracing your route.

Square pattern

A square uses four equal legs with 90-degree turns in the same direction.

Example starting at 30°: leg 1 at 30°, leg 2 at 120°, leg 3 at 210°, leg 4 at 300°. Swim each leg for the same number of kicks, and you should end up close to your start.

Most bezels have marks at 90-degree intervals to help. After each leg, rotate the bezel or turn to the next mark.

Triangle pattern

A triangle uses three equal legs with 120-degree turns.

Example starting at 0°: leg 1 at 0°, leg 2 at 120°, leg 3 at 240°.

Triangles cover less area than squares and have fewer turns, which some divers find easier to fly accurately.

Step 5: Kick counting and timing

A compass tells you direction, but not distance. Kick cycles or time give you a distance estimate.

Calibrate your kick count

1. In a pool or shallow water, lay out a known distance with a tape or a line with measured marks.
2. Swim it at your normal relaxed pace, in your normal gear, counting kick cycles. A kick cycle is usually counted each time the same leg completes a kick.
3. Repeat several times and average the result.
4. Write down kick cycles per unit of distance on your slate.

Kick counts change with fins, exposure suits, current and fatigue. Recalibrate when you change gear. For more on fins, see best dive fins by kick style.

Timed legs

Some divers time legs instead. Timing works if your pace stays steady, but it's less accurate in current. Many divers use both: count kicks and note time on the computer.

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Step 6: Natural navigation

Compass navigation works best combined with natural references:

• Sand ripples: often run parallel to the shore.
• Depth contours: getting deeper or shallower tells you whether you're heading away from or toward shore on sloping sites.
• Reef edges and walls: follow them out and back.
• Sun and light: the brighter direction shows where the sun is.
• Landmarks: distinctive rocks, coral heads or wreck features. Note them on the way out.
• Current direction: a consistent current can be a reference.

On the way out, pause and look back occasionally, so you'll recognize landmarks on the return.

A simple practice drill

1. On a shallow sand patch with good visibility, set a heading and swim 20 kick cycles.
2. Turn to the reciprocal and swim 20 kick cycles back.
3. Check how close you are to the start marker.
4. Repeat with a square pattern.
5. Try it with your buddy leading, and then with you leading.

Practice on land first. Walk the patterns in a park or on a beach with the compass held correctly.

Mistakes to avoid

• Tilting the compass. A tilted compass sticks or gives wrong readings.
• Swinging your arm instead of your body. Keep the lubber line on your centerline.
• Mounting near metal or electronics. Lights, cameras, steel tanks and magnets can deflect the needle. See night diving gear setup for placing lights.
• Ignoring current. Expect drift and correct with natural references.
• Not calibrating kick count. Kick counts vary a lot between divers and gear.
• Not agreeing on a plan. Brief headings, legs and turn points with your buddy. Our shore dive planning guide covers entries and exits.

What to do if you get lost

Stay calm and follow your training. Stop, check your gas and depth, and think. If you can't find a reference, your agency's procedures for a controlled ascent and surface signaling apply. Carrying a surface marker buoy is part of that plan. See how to shoot an SMB from depth and our best SMBs and reels.