Compared to an impressed current system, a galvanic anode system in soil has the following advantage:

A galvanic anode system operates through a natural electrochemical reaction between the anode material and the surrounding environment, which means it does not require an external power source to function. This is a primary advantage over impressed current systems that rely on a power supply to drive the protective current.

In applications where power availability is limited or where simplicity is desired, galvanic anodes provide an effective solution without the complexity of electrical connections. This feature makes them especially advantageous in remote or off-grid locations, where installing and maintaining a power source could be difficult or costly.

The other options involve characteristics that are generally associated with impressed current systems or specific performance factors rather than the inherent benefits of galvanic anodes. For instance, the capability to adjust current finely is a hallmark of impressed current systems, while high current capacity is also something more typical of those systems due to their controlled power supply. Galvanic anodes may not be the best fit in high resistivity soils, depending on the specific conditions and requirements of the installation.