Sighting Compass Accuracy — How Does It Compare to Baseplate?

Accuracy Comparison

When it comes to taking precise bearings, a sighting compass is the clear winner. This is because the sighting mechanism aligns the magnetic needle with the direction-of-travel arrow, allowing for a more accurate reading. In contrast, a baseplate compass relies on aligning the magnetic needle with a drawn line, which can be prone to human error.

Compass Types

There are two main types of sighting compasses: rotating bezel and fixed bezel. A rotating bezel compass is more common and offers flexibility, as the bezel can be rotated to match the direction of travel. A fixed bezel compass, on the other hand, has a fixed bezel that must be aligned with the direction-of-travel arrow. Both types offer high accuracy, but the rotating bezel model is more versatile.

Field Use

In the field, it’s essential to understand how to use your sighting compass effectively. To take a bearing, first, align the magnetic needle with the direction-of-travel arrow. Next, read the degree markings on the bezel to determine the bearing. For added accuracy, use the “two-needle method,” where you align the needle and direction-of-travel arrow, then use a second needle to confirm the bearing. This method helps eliminate any potential error caused by a misaligned needle.