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Key takeaways
- Analog compasses need no battery or calibration and work the same way on every dive.
- Digital compasses on dive computers can store headings, show deviation and sit on the same screen as depth and time.
- Both are affected by magnetic interference, and both need to be held level. Digital compasses may compensate for tilt, depending on the model.
- Digital compasses need calibration and a working battery, so they aren't a true backup to themselves.
- Carry an analog compass as a backup if you navigate often, dive at night, or do advanced or specialty courses.
Quick verdict
For most recreational divers, a digital compass on your dive computer is the most convenient way to navigate day to day. If navigation matters on your dives, carry a quality analog compass too. Analog compasses need no battery and no calibration, and they keep working if your computer shuts down. If you can only have one and you're buying a compass for a navigation course, pick analog. If you already own a computer with a digital compass, learn to use it well, and add an analog backup.
Comparison table
| Factor | Digital compass | Analog compass |
|---|---|---|
| Power | Needs battery | None |
| Calibration | Needed, per the manual | None |
| Stored headings | Yes, on most models | Bezel only |
| Tilt tolerance | Some models compensate | Limited by design |
| Readability | Screen-dependent, clear numbers | Dial and bezel, luminous marks |
| Magnetic interference | Affected | Affected |
| Extra device on wrist | No (built into computer) | Yes |
| Typical cost | Part of computer price | $–$$ |
Accuracy and reliability
Both types point to magnetic north, and both can be thrown off by nearby metal, magnets and electronics. The difference is in how they fail.
An analog compass fails in visible ways. If it's tilted, the card sticks. If there's interference, you'll often see the needle swing when you move near the source.
A digital compass depends on calibration. A poorly calibrated compass can show a heading that looks precise but is off. That's why calibration matters.
Calibration
Digital compasses need calibration, usually by rotating the computer through several orientations or a figure-eight. Manufacturers recommend calibrating after travel, battery changes or when readings seem off. Follow your manual.
Analog compasses need no calibration, but they're balanced for the magnetic dip in a particular region. Buy the right version for where you dive, or a globally balanced model. See our best dive compasses guide.
Battery and backup
A digital compass stops working when the computer's battery runs out, or if the computer fails. An analog compass has no battery. That's the strongest argument for carrying one. If you depend on navigation to get back to a boat or exit, carry a backup that doesn't share a battery with your primary. See what to do if your dive computer fails during a trip.
Readability and features
Digital compasses show a clear numeric heading and usually an arrow toward your stored heading. That's easy to read, especially on bright AMOLED or color screens. Some show reciprocal headings automatically.
Analog compasses use a dial and bezel. Luminous markings help at night, but you need to charge them with a light. Side windows let you read the heading while holding the compass level.
For night diving, both work. Digital screens are easy to read in the dark, while analog compasses need a light charge. See night diving gear setup.
Tilt tolerance
Analog compasses need to be held fairly level, or the card sticks. Better models tolerate more tilt. Some digital compasses use tilt compensation, so they read correctly even when not perfectly level. Check your manual. It's a real advantage in current or when you're hovering in odd positions.
Convenience
A digital compass lives on the computer you're already wearing, so there's no extra device on your arm. Stored headings make out-and-back navigation simple. Analog compasses add a device, and you set the bezel by hand.
Which to choose
Choose a digital compass if:
- You already own or plan to buy a computer with one, such as a Suunto D5, Shearwater Peregrine TX or Garmin Descent.
- You want stored headings and on-screen guidance.
- You navigate occasionally on recreational dives.
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Choose an analog compass if:
- You're taking an advanced or navigation course.
- You want a compass that never needs a battery or calibration.
- You dive where navigation is critical, such as low-visibility sites, shore dives with limited exits, or night dives.
Carry both if:
- You navigate often, or depend on navigation to reach an exit or boat.
- You want a backup that doesn't depend on your computer.
How to use both together
Many divers use the digital compass for primary navigation and keep an analog compass on the other wrist or in a console. Before the dive, compare both against a known heading. If they disagree underwater, trust the one you've checked and move away from possible interference, such as lights or cameras.
For technique, see how to navigate with a dive compass.
Mistakes to avoid
- Skipping calibration on a digital compass after travel.
- Mounting either type near lights, cameras or magnets.
- Relying on a digital compass as your only navigation tool on dives where navigation is critical.
- Buying the wrong hemisphere balance for an analog compass.
- Not practicing. Either compass is only as good as your technique.
Frequently asked questions
Is a digital dive compass as accurate as an analog one?
A well-calibrated digital compass can be very accurate, but it depends on calibration. Analog compasses don't need calibration but must be held level. Both are affected by magnetic interference.
Do I need an analog compass if my dive computer has a digital one?
It's a good backup, especially if you navigate often, dive at night or depend on navigation to reach an exit. Analog compasses don't need a battery or calibration.
How often should I calibrate my digital dive compass?
Follow your manual. Many manufacturers recommend calibrating after travel, battery changes or when readings seem off.
Do digital compasses need to be held level?
Some digital compasses compensate for tilt, which makes them more forgiving. Check your manual. Analog compasses generally need to be held level.
Which compass is better for night diving?
Both work. Digital screens are easy to read in the dark. Analog compasses have luminous markings that need charging with a light.