Final answer:
The lights are most likely connected in a parallel circuit.
Step-by-step explanation:
In a circuit where one switch is used to control all navigation lights, the lights are most likely connected in a parallel circuit.
In a parallel circuit, each light bulb or component has its own separate path to the switch, allowing the switch to control each light independently. This means that if one light bulb burns out or is switched off, the other lights remain unaffected.
This setup is commonly used in navigation lights to ensure that if one light fails, the other lights continue to function, providing safety and visibility.