How do metal objects affect navigation?

Metal objects can significantly influence navigation, particularly through their impact on compass readings. A compass relies on the Earth's magnetic field to determine direction. However, the presence of metal can create magnetic interference, causing the compass needle to deviate from true magnetic north. This phenomenon, known as magnetic declination, can lead to inaccurate navigation if the effect of nearby metallic objects is not accounted for.

In contrast, options suggesting that metal objects have no effect on navigation, enhance signal reception, or help in identifying landmarks do not accurately reflect the influence that metal has on compass operation. Therefore, understanding the interactions between metal objects and navigation tools is crucial for achieving accurate and reliable navigation results.