Final answer:
Navigational lights are identified by color, rhythm, and period, but not by intensity due to its variability with weather and distance.
Step-by-step explanation:
If you see several fixed navigational lights that are visible at the same time, each one may be positively identified by checking the Light List for certain characteristics. However, you would not use intensity for identification since it can be affected by factors like weather conditions and distance, which are not constants and therefore not listed in the Light List. Instead, you can identify navigational lights by their rhythm, color, and period since these are distinctive, constant attributes assigned to each light and reliably listed in navigational documentation.
To positively identify several fixed navigational lights, you can check their intensity, rhythm, color, and period against the Light List. Each light will have a unique combination of these characteristics, allowing for accurate identification. However, color is not a reliable indicator for identification since lights of the same color can differ in other properties. Therefore, you would not check color against the Light List to identify navigational lights.