Humminbird Piranhamax 4 DiPiranhaMAX 4 DI, adds Down Imaging to the entry level platform. Humminbird PiranhaMAX 4 DI The Humminbird PiranhaMAX 4 DI adds CHIRP Down Imaging to the entry level PiranhaMAX platform, see better detail of structure, bait, and fish below the boat. 4. 3" color display. Key Features 4. 3" Color Display CHIRP Down Imaging Standard 2D Sonar Bottom Tracking Standalone Unit Why Choose This Unit Choose DI over standard PiranhaMAX 4 when you want to see