CHIRP sonar is a frequency-modulated pulse that overcomes the limitations of current technology, which relies on a single-frequency pulse bouncing off fish and the bottom. Traditional sonar operates on either 50 kHz, for deepwater fish finding, or 200 kHz, in shallower water. When reading the bottom in 2,000 feet of water at 50 kHz, the amount of energy needed to reach the bottom requires a long sonic pulse: say 130 feet long. Underwater targets that are closer together than the length of that pulse are not going to show up separately on the finder screen. They get lumped together as one image. That’s with the current single-frequency pulse sonar.