The Humminbird Fishfinder 571 HD DI is a versatile monochrome sonar-only marine navigation system perfect for many types of boats. It has pristine picture quality and features usually found in higher-end models. The fish finder’s powerful Down Imaging sonar will help you clearly see his prey and its surrounding area.
The standard Down Imaging – Dual Beam Plus dual sonar is the main feature of the 571 HD DI. This powerful 500-watt sonar produces picture-like images that look great at any depth with viewing angles of up to 75 degrees with a maximum depth range of 600 feet. Its high frequency sound waves can penetrate even in the murkiest of waters and can spot any object or creature larger than two and a half inches. The sonar can switch between wide-sweep and narrow-bean signals to produce even better levels of detail. It even has a noise-reduction feature for capturing images of fast moving prey. However, the sonar can produce smeared images in rough seas.
The sonar’s fine images are displayed in real-time on a five-inch grayscale LCD screen. This dual-panel screen has a resolution of 640×320 and features split-screen zooming, sonar echo enhancements, and fish identifications. There is even a temperature gauge read from an onboard thermocouple.
One of the coolest features of the 571 HD Di is the Switchfire Sonar. This optional alternative sonar technology comes pre-loaded and gives every angler complete control of their sonar signals. The Switchfire sonar has two viewing modes: Clear and Max. Clear mode filters out all noise from agitated and shallow water to produce clean and crisp looking images of all fish and structures below the boat. In clear mode, you see only what you want to see. In Max mode, the 571 HD DI shows everything including underwater structures, fish, thermoclines and even water currents. Putting the unit in Max mode lets you keep an eye on your bait and line for any and all types of motion.
These powerful sonar and display technologies are bundled in a user-friendly package that easy to use, setup, and customize. The 571 HD DI has several signal view and readout options to choose from, and you can change both the display and background colors. The dashboard mount also detaches quickly and easy lets you move the sonar wherever you need it the most. The device is also equipped with Humminbird’s own X-Press menu system. The X-Press Menu provides quick access to your most frequently used features. All you have to do to enter the menu is to press the menu button once and you are in. Pressing the button again leads to the main menu.
Finally, there is an optional Triplog feature available if you have a Speed Accessory, GPS or Paddlewheel attached to your HD DI that provides average speed, distance traveled, elapsed time, and other trip-related information. The Humminbird Fishfinder 571 HD DI is an excellent choice for any fisherman that needs a simple but powerful fishing sonar.
|Humminbird 561 DI||Lowrance Mark-5x DSI||Humminbird 571 DI|
|Screen Size||5 in / 127 mm||5 in / 127 mm||5 in / 127 mm|
|Screen Resolution||320 x 320 pixels||480 x 480 pixels||640 x 320 pixels|
|Display Type||12-level grayscale||16-level grayscale LCD||16-level grayscale|
|Imaging||2D and Down Imaging||Down Imaging||2D and Down Imaging|
|Transmit Power||R00W RMS|
|Sonar Frequency||200/455 kHz 2D Sonar|
455/800 kHz Down Imaging
|455/800 kHz||200/455 kHz 2D Sonar|
455/800 kHz Down Imaging
|Maximum Depth||350 ft (DI), 600 ft (2D)||250 ft||350 ft (DI), 600 ft (2D)|