The basic difference is that sonar (sound navigation and ranging) uses sound (which is mechanical energy) to "look" through water or other media, and radar (radio direction and ranging) uses...
Sonar is a system for making a picture of the surrounding environment, using echoes. Bats use sonar to create a mental picture of the environment. They do this by making high frequency chirps that...
Side scan sonar uses sonar to map the the ground below by emitting continuous sonar pulses while moving. The sound continuously reflects back to the system's receiver, which creates an image based on...
Sonar (Sound Navigation and Ranging, my particular job) is used primarily for contact detection and avoidance, and virtually always used in Passive Mode (listening). The only exception is when the...