Baseplate compasses give you a transparent surface for working on a paper map, while sighting compasses add a mirror or sight for lining up a bearing with a distant landmark; some designs combine these features. Small button compasses suit broad direction checks, but their limited markings make detailed route work harder. Start by deciding whether the compass will ride in a pocket for frequent checks or travel with your map kit, where a larger instrument may be easier to accommodate.
Among the 16 products that list item weight, most fall between 0.1 and 0.5 pounds, and 0.2 pounds is typical. Weight cannot tell you whether a compass fits a jacket pocket: compare its closed dimensions with the pocket or pouch you intend to use. A hinged cover can protect the face during transport, but adds an opening step whenever you take a reading. If you plan to hang the compass from your neck or attach it to your pack, look for a suitable attachment point and establish whether the lanyard or clip is supplied or sold separately.
For repeated map navigation, adjustable declination lets you account for the local difference between magnetic north and true north on the instrument; a fixed declination scale still requires you to apply the correction when taking or plotting bearings. For travel between distant regions, check the compass's stated geographic balancing zone, since some magnetic needles are balanced for particular parts of the world. For readings in poor light, inspect the graduation spacing and determine whether the illumination requires prior light exposure, uses batteries or is self-luminous.
Before buying, compare any printed map scales with the maps you carry, and check whether the bearing markings use degrees or another unit your navigation instructions require. Consult the manual's separation guidance for magnets, metal and electronics that could disturb readings, particularly if you intend to mount the compass near handlebars or other equipment. Plastic and Aluminum filter values leave the component unspecified, so identify whether each describes the baseplate, housing or cover. Check the manufacturer's stated water resistance against your intended conditions, including rain, splashes or possible immersion.
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