What type of switch is used to control navigation lights in a single circuit?

The correct choice is the single-pole, single-throw (SPST) switch, as it is the simplest type of switch that is suitable for controlling navigation lights on a single circuit. An SPST switch has two terminals and operates by either allowing or interrupting the flow of electricity in a straightforward manner. This makes it ideal for applications where you want to toggle a single light or a set of lights on and off without any added complexity.

In the context of navigation lights, which typically require a simple on/off function, the SPST switch provides a reliable and efficient means to achieve this. Its design ensures that there is a clear and direct pathway for the electrical current whenever the switch is activated.

This option is well-suited for straightforward lighting applications, avoiding unnecessary complexities that other switch types may introduce. For example, while a double-pole, double-throw (DPDT) or single-pole, double-throw (SPDT) switch allows for more complex circuit control or multiple configurations, it is not required for the basic on/off function of navigation lights. Similarly, a triple-pole switch would be unnecessarily complicated for a single circuit application. Hence, the SPST switch is the best fit for controlling navigation lights effectively.