Sometimes, you need every possible weapon at your disposal. Days like these call for the HELIX™ 7 CHIRP SI GPS G2 and its full arsenal of amazing technologies, including Side Imaging®, Down Imaging® and SwitchFire® Sonar. The seven-inch wide screen is the perfect canvas for your choice of split-screen views. The single card slot accommodates Humminbird® LakeMaster®, AutoChart™ and AutoChart™ Pro, as well as Navionics®+. Leading-edge technology has never been closer in reach. CHIRP Frequencies (Out of Box Transducer) 83 kHz: 75-95 kHz 200 kHz: 175-225 kHz 455 kHz: 420-520 kHz Maximum Depth: 1500 feet CHIRP Frequencies (Optional Purchase Transducer) Low: 28-75 kHz Med: 75-155 kHz High: 130-250 kHz 83/200: 75-155/130-250 50/200: 28-75/130-250 Maximum Depth: 2500 feet