What is a common source of electromagnetic interference in marine electronics?

Electromagnetic interference (EMI) can disrupt the reliable operation of various marine electronic systems, and one of the most common sources of this interference is alternators and engines. These components generate electrical noise through their normal operation, particularly when alternators are charging batteries or engines are running. This electrical noise can create fluctuations in the electrical fields around them, which may affect the performance of sensitive electronic instruments.

In contrast, while GPS units, radar systems, and depth sounders are also essential components of marine electronics, they typically do not emit the same level of interference as alternators and engines. Instead, they rely on different technologies that are generally designed to minimize such impact. Therefore, the significant level of EMI generated by alternators and engines makes them a key consideration when diagnosing interference issues in marine electronic setups.