Compass Buying Guide

For anglers and hikers, a reliable compass is a fundamental piece of safety gear, not just a navigation tool. While modern GPS devices are powerful, a compass doesn’t rely on batteries or satellite signals, making it a dependable backup when technology fails. The key to finding the best compass for your needs lies in understanding the different types available and which features are essential for your style of outdoor travel. This guide will walk you through the core considerations, from basic construction to advanced features, helping you make an informed choice that complements your outdoor navigation basics.

Types of Compasses: Baseplate, Lensatic, and Thumb Models

Compasses are designed for different uses, and selecting the right type is the first step in finding the best compass for your adventures.

Baseplate Compasses: This is the classic orienteering compass. It features a rectangular, transparent baseplate with a rotating bezel around the magnetic needle capsule. Scale markings on the edges help with map measuring and plotting courses. Its flat design makes it ideal for use with a map, as you can lay it directly on the paper to take bearings and plot routes. For general hiking, backpacking, and fishing trips where you’ll use a topographic map, a baseplate model is typically the most versatile and user-friendly option.

Lensatic Compasses: Known for their durability and precision, these compasses have a protective lid that houses a sighting lens and wire. You open the lid, sight an object through the wire, and read the bearing through the lens. They are excellent for taking highly accurate bearings to distant landmarks. While they can be used with a map, they are not as intuitive for that purpose as a baseplate compass. Their robust construction often makes them a favorite for demanding conditions.

Thumb Compasses: These are compact, minimalist compasses designed to be worn on the thumb. They allow for very fast, one-handed bearing checks while on the move, which is why they are popular in competitive orienteering. They typically lack a baseplate for map work and are best suited for those who are already proficient with navigation and need speed above all else. For the average hiker or angler, they are less practical as a primary navigation tool.

Essential Features: Declination Adjustment and Sighting Mirrors

Beyond the basic type, specific features greatly enhance a compass’s utility and accuracy in the field.

Understanding these features helps you move beyond a basic tool to a capable navigation instrument. For a deeper dive into modern tools, see our GPS device buying guide to understand how compasses and GPS work together.

Durability and Construction: Liquid-Filled Capsules and Materials

A compass is a long-term investment, and its construction determines how well it will survive the bumps, drops, and weather of outdoor life.

The magnetic needle capsule should be liquid-filled. The liquid (usually a clear oil or alcohol) dampens the needle’s movement, allowing it to settle quickly and steadily rather than oscillating wildly. This makes for faster, more stable readings. A well-sealed capsule also prevents bubbles from forming, which can impede the needle and reduce accuracy.

The housing material is equally important. High-impact plastics or rubberized armor provide shock resistance if dropped on rocks. Metal housings, often found on lensatic models, offer extreme durability but can be heavier. The baseplate should be made of a transparent, flexible yet scratch-resistant material. A lanyard hole is a simple but vital feature, allowing you to secure the compass to your gear or person.

Scale Rulers and Map Compatibility

For navigation that involves a map, your compass must work seamlessly with it. This is where scale rulers and design become crucial.

The edges of a baseplate compass are printed with multiple scale rulers, typically matching common map scales like 1:24,000 (standard USGS topo maps) and 1:50,000. This allows you to measure distances directly on the map without needing a separate ruler. The transparency of the baseplate lets you see the map details underneath while plotting a course.

When choosing a compass, consider the maps you use most often. Ensure the compass has the right scale markings. Some advanced models also have a magnifying lens built into the baseplate, which is helpful for reading the fine print on topographic maps. This integration of map-reading tools is what makes a baseplate compass the centerpiece of traditional land navigation.

Selecting a Compass for Fishing and Hiking Applications

Your primary activity should guide your final choice. The needs of a kayak angler are different from those of a mountain hiker.

Remember, your compass is part of a larger outdoor field gear system. It should be accessible, often carried in a pocket or attached to your waterproof backpack or outer clothing layer for quick use.

Care and Maintenance to Ensure Accuracy

A compass requires minimal but important care to remain trustworthy.

• Cleaning: Wipe with a damp cloth. Avoid harsh chemicals or solvents that could cloud the baseplate or damage markings.
• Storage: Keep it in a protective case or pouch when not in use to prevent scratches. Store it flat and away from heat sources, magnets, and heavy metal objects.
• Checking for Bubbles: Small bubbles in the capsule are normal, especially with temperature changes. A large bubble that interferes with the needle’s movement means the seal is compromised, and the compass should be replaced.
• Needle Swing: The needle should rotate freely and point consistently in the same direction when you turn in place. If it sticks or seems sluggish, the compass may be failing.

Practice Exercises for Proficiency

Owning the best compass is useless if you don’t know how to use it. Practice in a familiar, safe area before relying on it in the backcountry.

1. Taking a Bearing from a Map: Place your compass on the map with the edge forming a line between your location and your destination. Rotate the bezel until the orienting lines are parallel with the map’s north-south lines. The bearing at the index line is your map bearing to follow.
2. Following a Bearing in the Field: Hold the compass level, turn your body until the needle is boxed in the orienting arrow. The direction-of-travel arrow now points to your destination. Sight a landmark in that direction and walk to it.
3. Triangulation (Finding Your Location): If you are lost but can identify two distant landmarks on your map, take a bearing to each landmark. Transfer these bearings back to the map by drawing lines from each landmark along the back-bearing. Your location is where the lines cross.

Regular practice builds confidence and skill, making navigation second nature. This proficiency is as important as having the right rain gear for changing weather.

FAQ

What is declination adjustment and why is it important?

Declination is the angular difference between true north (the North Pole) and magnetic north (where your compass needle points). This difference varies by location and changes slowly over time. If you don’t account for declination when using a map (which is oriented to true north) with a compass (which points to magnetic north), you could navigate significantly off course. A compass with a declination adjustment lets you set this value so your compass readings are automatically corrected, simplifying navigation and reducing errors. You can find the current declination for your area on topographic maps or through official sources like the National Oceanic and Atmospheric Administration (NOAA).

Do I need a compass with a sighting mirror?

A sighting mirror is not strictly necessary for basic navigation, but it greatly improves accuracy when taking bearings to specific, distant landmarks. The mirror allows you to simultaneously align the compass’s sighting line with the landmark and view the compass dial, ensuring you are holding the compass perfectly level and aligned. For activities like off-trail hiking, navigating open water in a boat, or precise route-finding, a mirror is a valuable feature. For casual trail hiking where you are primarily following a pre-plotted course on a map, a standard baseplate compass may suffice.

How do I know if a compass is reliable?

Check for these indicators of a reliable compass: a liquid-filled capsule with a needle that settles quickly without sticking; a clear, bezel that rotates smoothly; and sharp, legible markings. The baseplate should be transparent and not warped. Reputable manufacturers provide specification sheets detailing features like global needle balancing and waterproof standards. Ultimately, reliability is proven through consistent performance. Test a new compass in a known area, comparing its bearings to a trusted source or another compass. Regular care and proper storage, away from magnets, are essential to maintaining that reliability over time.