The new FishMark® 320 is the absolute best buy in LCD fishfinders today, comparing features to price. Superior 320x320 pixel resolution, target separation and power. The all-new choice of tournament pros! Display: 5" (12.7 cm) diagonal screen Film SuperTwist LCD 320x320 resolution Backlit screen and keypad 16-level grayscale Sonar: Depth capability to 800 ft* (244 m) with 1500 watts of peak-to-peak power High-performance, low-profile 200 kHz Skimmer® transducer delivers a wider, more effective fish detection area of up to 60º with high sensitivity settings - Operates at boat speeds up to 70 mph (61 kts) Trolling speed and distance log readings available with purchase of an optional sensor FishReveal™ feature exposes fish targets hidden in surface clutter, weed beds, thermoclines, and other types of underwater cover HyperScroll™ feature locates and displays fish targets at higher boat speeds Advanced Signal Processing (ASP™) automatically adjusts your settings for the best sonar picture Patented GRAYLINE separates fish from nearby structure and bottom Advanced Fish I.D.™ shows underwater targets in different sizes of fish symbols FishTrack™ displays target depth readings above fish symbols Surface water temperature readings come from a built-in temp sensor in the transducer Unique display feature lets you combine a panel of sonar data readings with your sonar graph in one easy-to-read display Zoom with zoom bottom tracking and easy zoom-in/out control Selective on/off sonar alarms: Shallow, Deep, Fish and Zone Optional Portable Version: Optional pack includes Port-Power Pack case and portable 200 kHz Skimmer® transducer with suction-cup mounting bracket (batteries not included) Performance: High-speed screen updates during depth range changes for uninterrupted viewing Internal back-up memory for key sonar settings Completely sealed and waterproof, even for use in harsh saltwater environments Full one-year warranty