What is the most common radar indicator group used in the Navy?

The most common radar indicator group used in the Navy is the AN/SPA-25G. This radar system is primarily utilized for air traffic control and supporting military operations, providing critical data for the safe navigation and operation of naval vessels. The AN/SPA-25G system is known for its reliability and effectiveness in a variety of maritime environments, making it a standard choice among naval applications.

The other radar systems listed, while they serve important functions, are specialized for different uses. For example, the AN/SPN-43 is designed for precision approach radar but is less commonly used overall compared to the AN/SPA-25G. Similarly, the AN/SPN-44 is used for landing approaches, focusing exclusively on air traffic control rather than broader navigation purposes. The AN/FPN-63(V), while effective in its role, is specific to target tracking and is not as widely implemented as the AN/SPA-25G within the Navy's operational framework.