Galvanic anodes are usually preferred in situations where:

Galvanic anodes are typically preferred in situations where small amounts of current are required due to their capability of providing a consistent and reliable source of cathodic protection in specific environments. This is particularly advantageous in applications where the demands for current are limited or where the protected structure has a smaller surface area.

In scenarios with small current requirements, galvanic anodes, which operate based on electrochemical reactions, can efficiently provide just enough current to protect the metal structure without excessive waste. They work well in localized areas where it's critical to manage corrosion effectively without overspending energy or material resources.

While galvanic anodes can be used in remote locations or with high soil resistivity, those aspects typically favor impressed current systems in larger or more complex applications that require significant power. Thus, small amounts of current represent an ideal application for galvanic anodes, making them particularly suitable for such situations.