DualBeam PLUS 83/200 KHz and down imaging 455/800 KHz
Down Imaging sees down to 350'
SwitchFire adapts for calm and rough conditions
DualBeam PLUS employs two sonar beams for versatility
Add the Humminbird 571 HD DI to your fishing tactics, and you'll get a high-definition, moment-to-moment, all-seeing view of everything beneath your boat. Humminbird has packed Down Imaging®, SwitchFire™ and DualBeam PLUS™ behind this unit's 5", 16-level-grayscale, 640V x 320H display. Created by high-frequency sound waves that reach down to 350 feet, the Down Imaging delivers a straight down, clear and detailed "snapshot" of what's below. Using SwitchFire, the angler takes complete command of how the sonar images appear. With two unique display modes, you can adjust to your fishing conditions, add or remove details, account for depth and temperature. SwitchFire's Clear Mode reduces undesired clutter in the water column in rough waters. In calmer waters, Max Mode delivers cover, structure, bait presentation, nearby fish and even water currents in incredible detail. Utilizing the DualBeam PLUS™ sonar, you get two sonar beams: one that's tightly focused on the bottom directly below, and the second more-expanded beam surrounds the first in order to detect fish in a much wider area. You can use these two beam independently, or have them work together for a crystal-clear picture of everything below the boat. 4,000-watt peak-to-peak. 500-watt RMS. One-year warranty.