Sonar Technology CHIRP

CHIRP stands for Compressed High-Intensity Radiated Pulse. Unlike traditional sonar that sends a single-frequency ping, CHIRP continuously sweeps through a range of frequencies in each pulse. This frequency sweep produces dramatically sharper images with better target separation, meaning you can distinguish individual fish that are close together rather than seeing them as one blob.

A traditional 200 kHz sonar sends a short burst at exactly 200 kHz. A CHIRP unit transmitting in the same band might sweep from 150 kHz to 250 kHz in a single pulse. By analyzing how different frequencies return, the processor can extract far more information from each ping cycle. The result is thinner, more defined fish arches, clearer bottom definition, and better performance at depth.

Most modern fish finders come with CHIRP as standard. You will commonly see three CHIRP bands available. Low CHIRP (28–75 kHz) penetrates deep water and covers a wide cone, ideal for offshore use. Medium CHIRP (75–155 kHz) balances depth and detail. High CHIRP (150–250 kHz and above) delivers the finest resolution in shallower water, perfect for inland lakes and rivers. Premium units allow you to run multiple CHIRP bands simultaneously on a split screen.

CHIRP has essentially replaced traditional single-frequency sonar as the baseline technology across all major brands. Even budget fish finders now include CHIRP capability, making it the entry point for modern fish finding rather than a premium upgrade.