Answer: Metaphor
Step-by-step explanation:
A metaphor refers to the figure of speech whereby a comparison is made between two things which are not alike but when they have something in common. The comparison in a metaphor is more indirect unlike the simile where like.or as is used for the comparison.
The rhetorical device used in "The stars are my road map, marking the way" is the metaphor. In this case, the " starts are my roadmaps" symbolize what the stars means to the speaker.