Used Boat Compass for Sale: 10 Best Options for Buyers (2026)

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If you are looking for a used boat compass for sale, you are likely trying to replace a worn-out unit, equip a secondhand boat, or add a backup to a dinghy or cruiser. A used compass can save money, but it also carries risks: a cracked bowl, a dried-out or bubbled liquid fill, a card that sticks, or a mounting base that no longer lines up. The selection criteria in this guide focus on the things that matter most for seamanship: whether the instrument is a magnetic card compass or an electronic one, the bowl and damping design, the mounting style (binnacle, deck, or hand-bearing), card readability and lubber line quality, and whether the unit can still be calibrated or compensated. We researched each pick through published specifications, manufacturer documentation, brand reputation, and patterns in owner feedback. We did not test these instruments ourselves, so check any unit in person before you pay.

Our Top Picks

Quick Comparison

Product	Best for	Key feature
Ritchie Explorer Compass	Dinghy and small boat owners	Liquid-filled bowl with lightweight card
Ritchie Globemaster Compass	Cruisers wanting a traditional binnacle style	Large card for easy reading at the helm
Ritchie Helmsman Compass	Sailors needing a mid-size deck or bulkhead mount	Damped card that settles quickly
Plastimo Iris 50 Compass	Small sailboats and tenders	Compact deck-mount housing
Plastimo Iris 100 Compass	Mid-size sailboats and motor cruisers	Liquid damping with a bright, legible card
Suunto KB-14 Hand-Bearing Compass	Navigators taking bearings from the cockpit or deck	Sighting mirror and rotating bezel
Silva Ranger Hand-Bearing Compass	Hikers and boaters wanting a rugged backup	Declination adjustment and sighting lens
Ritchie X-11 Compass	Owners wanting a sporty, low-profile instrument	Compact housing with a clear lubber line
Airmar Compass Sensor (NMEA 2000 style)	Owners with electronic instrument systems	Digital heading output to a chartplotter
Raymarine Compass Sensor	Owners integrating heading into an existing plotter network	Electronic heading data for autopilot and displays

Ritchie Explorer Compass

This is a widely known small-boat compass suited to dinghies, tenders, and open boats where space is limited and a simple, sealed unit is the goal. It is a common choice for secondhand purchases because the design is straightforward and parts are easy to identify.

Key specs

• Liquid-filled bowl with card damping
• Compact housing for small-boat mounting
• Lubber line for reading heading at the helm
• Typically supplied with a mounting base or bracket

Pros

• Simple, proven magnetic design
• Small footprint suits tenders and dinghies
• Easy to find replacement parts for many models

Cons

• Smaller card can be harder to read in rough conditions
• Liquid fill can develop bubbles if the bowl was damaged

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Ritchie Globemaster Compass

Aimed at cruising boats that want a larger, traditional binnacle-style instrument, this model suits owners who steer from a fixed helm station and want a clearly readable card in the daytime and at night with a light.

Key specs

• Larger card diameter than small-boat models
• Liquid-damped bowl
• Designed for binnacle or fixed mounting
• Lubber line and card lighting options on some versions

Pros

• Large card is easier to read at a distance
• Traditional look suits many cruising boats
• Stable damping reduces card swing in chop

Cons

• Larger size needs more mounting space
• Heavier than dinghy compasses, which matters on lightweight boats

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Ritchie Helmsman Compass

This mid-size model is a sensible choice for sailors who want a dependable deck or bulkhead instrument for daysailers and coastal cruisers, balancing readability against installation size.

Key specs

• Mid-size card with liquid damping
• Suitable for deck or bulkhead mounting
• Lubber line aligned to the bowl

Pros

• Good compromise between size and readability
• Damped card settles reasonably quickly
• Works well as a primary or backup compass

Cons

• Mounting bracket may need custom work on some boats
• Card lighting is not standard on all versions

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Plastimo Iris 50 Compass

A compact deck-mount instrument aimed at small sailboats and tenders, the Iris 50 suits owners who need a simple, low-profile compass without a bulky binnacle.

Key specs

• Compact housing designed for deck mounting
• Liquid-filled bowl
• Small card with lubber line

Pros

• Low profile fits crowded cockpits
• Straightforward installation on small boats
• Clear, uncluttered card layout

Cons

• Smaller card is harder to read at a glance in rough water
• Limited mounting options compared with larger models

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Plastimo Iris 100 Compass

Suited to mid-size sailboats and motor cruisers, this model offers a larger liquid-damped card for owners who steer for long periods and want a steady, easy-to-read heading.

Key specs

• Larger liquid-damped bowl
• Bright, legible card face
• Deck or bulkhead mounting

Pros

• Good readability for longer passages
• Damping helps in lumpy conditions
• Fits a range of mid-size installations

Cons

• Needs more space than small-boat compasses
• Used units should be checked carefully for bowl leaks

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Suunto KB-14 Hand-Bearing Compass

A hand-bearing compass for taking bearings on other objects, the KB-14 is suited to navigators who need a portable instrument for position fixing, transit checks, and backup navigation rather than a permanent helm compass.

Key specs

• Sighting mirror for bearing takes
• Rotating bezel for setting bearings
• Liquid-damped capsule

Pros

• Portable and useful for taking bearings from anywhere on deck
• Sighting mirror makes precise readings easier
• Well-known brand with broad support

Cons

• Not a substitute for a fixed helm compass
• Requires practice to take accurate bearings

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Silva Ranger Hand-Bearing Compass

Built for outdoor and marine use, this compass suits sailors who want a rugged handheld backup with a sighting lens and a declination adjustment for more accurate readings.

Key specs

• Sighting lens for bearing takes
• Declination adjustment
• Liquid-damped housing

Pros

• Declination adjustment is useful in areas with significant magnetic variation
• Rugged, field-friendly design
• Good backup for dinghy or cruising use

Cons

• Lens and bezel can wear with heavy use
• Not designed as a permanent steering compass

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Ritchie X-11 Compass

A low-profile, sporty-looking instrument for owners who want a compact compass that does not dominate the cockpit, the X-11 is a practical fit for daysailers and small performance boats.

Key specs

• Compact sealed housing
• Liquid-damped card
• Clear lubber line

Pros

• Compact and unobtrusive
• Simple, sealed design
• Good match for small boats with limited space

Cons

• Smaller card is less legible at a distance
• Limited accessories compared with larger models

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Airmar Compass Sensor (NMEA 2000 style)

Electronic heading sensors like this suit owners with networked instruments who want digital heading data for chartplotters, autopilots, and radar overlays rather than a traditional card compass.

Key specs

• Electronic heading output
• Designed for networked marine electronics
• Requires a compatible instrument network

Pros

• Feeds heading to multiple displays and autopilots
• No card to stick or bubble
• Useful for integrated systems

Cons

• Requires a compatible network and power supply, so it is not a standalone compass
• Needs careful installation away from magnetic interference

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Raymarine Compass Sensor

For owners who already run Raymarine displays or autopilots, an electronic compass sensor provides heading data that integrates with the existing network, making it a logical choice for upgrading or replacing a worn card compass in an electronics-driven boat.

Key specs

• Electronic heading output for networked systems
• Compatible with Raymarine instrument ecosystems
• Requires professional or careful DIY installation

Pros

• Integrates with existing Raymarine displays
• Supports autopilot heading input
• No mechanical card to maintain

Cons

• Only useful within a compatible electronics setup
• Installation and calibration require attention to magnetic interference

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Buying Guide

Selection criteria for a used boat compass

Start with the job the compass must do. A primary steering compass needs to be readable from the helm, damped enough to settle in a seaway, and mounted solidly. A backup or hand-bearing compass has different priorities: portability, a sighting device, and accuracy when taking bearings. Electronic heading sensors serve a different role again, and they only make sense in an integrated system.

Important features to inspect

• Bowl condition: Look for cracks, clouding, or bubbles in the liquid-filled bowl. Bubbles usually mean the seal has failed, and the damping will be inconsistent.
• Card movement: A healthy card rotates smoothly and settles within a few seconds after a turn. A card that sticks or swings wildly needs attention.
• Lubber line: Check that the lubber line is clear, correctly aligned, and not scratched.
• Card readability: Faded or discolored cards are hard to read in sunlight and at night.
• Mounting base: Confirm that the base is not cracked and that the mounting holes match your deck or binnacle.

Specs to check before buying

• Card diameter, which affects readability
• Damping method (liquid or none)
• Mounting style (deck, bulkhead, binnacle, or hand-bearing)
• Presence of a sighting device or declination adjustment
• Compatibility with your boat’s electronics if you are considering an electronic sensor

Choosing by need

1. Dinghy or small open boat: A compact, sealed, liquid-damped compass is usually enough.
2. Cruising sailboat or motor cruiser: Choose a larger card and a mounting that is easy to read from the helm.
3. Backup navigation: A hand-bearing compass with a sighting device is a useful addition.
4. Integrated electronics: An electronic heading sensor may be the right choice, provided it is compatible with your system.

Things to watch out for

• Compasses that have been stored in extreme heat or freezing conditions can develop bowl problems.
• Magnetic interference from speakers, wiring, or steel fittings can throw off a compass. Check it on a known heading before relying on it.
• Declination changes over time and by location. A compass that was accurate elsewhere may need adjustment for your area.
• Used compasses rarely come with a deviation card, so plan to have deviation checked after installation.

Installation and compass deviation work involve safety considerations. Consult a qualified marine technician or a certified professional before mounting or calibrating a steering compass, especially on a boat you rely on for offshore passages.

FAQ

Is a used boat compass safe to buy?

It can be, provided you inspect it carefully. Check the bowl for cracks or bubbles, confirm the card moves freely and settles, and make sure the lubber line is intact. Buying from a reputable seller with a return option reduces risk.

How do I know if a used compass is still accurate?

Compare its reading to a known bearing, such as a charted transit or a landmark on a known heading. Check it in several headings. Significant differences, or a card that will not settle, suggest the compass needs service or replacement.

What is the difference between a helm compass and a hand-bearing compass?

A helm compass is mounted permanently and shows your heading while steering. A hand-bearing compass is portable and used to take bearings on objects, which is useful for position fixing and checking your course.

Do I need to compensate or calibrate a used compass?

Yes, if it is installed on a boat with steel, electronics, or other magnetic sources nearby. Compass deviation should be checked and recorded on a deviation card, ideally by a qualified professional.

Can an electronic compass sensor replace a card compass?

It can serve as the heading source in an integrated system, but it does not work alone. It needs a compatible network and display. Many sailors keep a traditional card compass as a backup regardless of their electronics.

How should I store a compass between seasons?

Keep it out of direct sun and extreme temperatures, and avoid storing it near magnetic sources. Check the bowl and mount at the start of each season before you rely on it.

What should I check when buying a used compass in person?

Inspect the bowl, card, lubber line, and mounting base. Spin the card and watch how quickly it settles. If possible, check the compass on a known heading or against a second compass.

Conclusion

For a dinghy or small open boat, a compact sealed model such as the Ritchie Explorer or Plastimo Iris 50 suits most needs. Cruisers wanting a readable helm instrument should look at the Ritchie Globemaster or Plastimo Iris 100. For backup navigation and bearing takes, the Suunto KB-14 and Silva Ranger hand-bearing compasses are sensible choices. If your boat runs integrated electronics, an electronic heading sensor such as the Airmar or Raymarine options may be the better fit. Whatever you choose, inspect the used unit carefully, verify its accuracy, and have deviation checked after installation.

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