A traditional sonar sends out a single frequency pulse at a time. A CHIRP (Compressed High Intensity Radiated Pulse) sonar sends out a continuous flow of frequencies, ranging from low to high and because of this, the sonar readings are much clearer and have a higher resolution compared to traditional sonars. Deeper CHIRP is the only castable fish finder that: Scans down to 330ft and casts out to 330ft. Finds fish 6” from water’s surface. Has three beam frequencies (Wide 100kHz 47°, Medium 290 kHz 16°, Narrow 675kHz 7°) and a superior 0.4” target separation. Portable, wireless and castable. Use it for fishing on or offshore, in saltwater or freshwater. Troll from a kayak or small boat or cast from the shore or SUP. It has a traditional ice flasher display so you can take it ice fishing….take it practically anywhere. Charge battery to 80% in 45 minutes and 100% in just 75 minutes.