The AN/SPS-55 radar detects targets from as close as 50 yards to as far as how many nautical miles?

The AN/SPS-55 radar is designed as a surface search radar that provides capability for detecting targets at varying distances. It is primarily used for navigation and situational awareness purposes and is effective in maritime environments. The radar's range allows it to detect targets from very close distances, starting at 50 yards.

Based on the specifications of the AN/SPS-55, it has a maximum detection range of 50 nautical miles. This makes it suitable for a variety of tasks such as collision avoidance, search and rescue operations, and other navigation-related functions, ensuring that vessels have a good situational awareness over considerable distances while still being able to detect nearby objects.

The other options suggest maximum ranges that exceed the actual capability of the radar, making them incorrect in this context.