A bat's navigation aid is commonly known as echolocation, which uses high-frequency sound waves for orientation and detecting prey. However, there are other synonyms for this unique ability of bats, including biosonar, sonar, and acoustic orientation. Biosonar refers to the process of emitting and receiving sound waves for navigation, while sonar is a broader term used to describe the use of sound waves for detection and ranging. Finally, acoustic orientation refers to the ability of bats to use sound waves to locate objects in their environment. Overall, these synonyms highlight the incredible sensory system of bats and how they use sound waves for their survival.