A CHIRP (Compressed High Intensity Radiated Pulse) sonar sends out a continuous flow of frequencies, ranging from low to high. Here is the range of frequencies that the Deeper CHIRP emits, depending on the Beam setting:
High CHIRP beam (7°): 635 kHz - 715 kHz
Mid CHIRP beam (16°): 270 kHz - 310 kHz
Low CHIRP beam (47°): 90 kHz - 115 kHz