What is the correct method to determine a bearing in the field with a compass?

To determine a bearing in the field with a compass, the method involves holding the compass level and properly aligning the moving magnetic needle with the north mark on the bezel. This allows for an accurate reading of the direction you are facing or planning to go. By keeping the compass level, you ensure that the needle can swing freely to align itself with the Earth's magnetic field, which is essential for gaining an accurate bearing.

Rotating the bezel until the north marker aligns with the needle also compensates for the magnetic declination, allowing you to get a true direction based on your specific location. This process is fundamental in navigation and helps prevent errors that could arise from incorrect holding positions or angle misalignments.

The other methods listed are not effective for getting an accurate bearing. Holding the compass at an angle can distort the reading, while using a mirror introduces unnecessary complexity and does not provide a straightforward means of navigation. Pointing the compass at the sun is not a reliable method, as it does not relate to the Earth's magnetic field and can lead to confusion in determining the correct direction.