Which principle should you follow while using a compass for navigation?

The Compass-to-Cheek Method is effective for navigation because it allows for a stable and accurate way to take a bearing. In this method, you hold the compass close to your cheek and align the sighting line of the compass with your eye, which helps reduce any potential parallax error that can occur when taking a reading. This positioning ensures that you can clearly see both the compass needle and the direction of travel arrow aligned with your desired target point.

By keeping the compass close to your cheek, you have better control over your sight picture and are less likely to introduce errors that can occur when holding the compass at a distance from your body. This technique enhances your ability to accurately orient yourself and maintain your course while navigating through varied terrain. The other methods may not provide the same level of precision and stability, which is crucial during navigation in the field.