Do you prefer an internal antenna over an external antenna? If so, this combo sonar & mapping iGPS is your best choice, with a 256-color, sunlight-viewable 640Vx480H pixel, high-res TFT display! Display: Ultra-bright, 5" (12.7 cm) diagonal screen 256-color, enhanced TFT LCD High-definition 640Vx480H resolution Fluorescent cold-cathode backlit screen and keypad Unique Resize Window to adjust split-screen display Overlay Data feature displays sonar/GPS data on any full- or split-screen display Sonar: Depth capability to 800 ft* (244 m) with 1500 watts of peak-to-peak power (187W RMS) High-performance, low-profile 200 kHz Skimmer transducer with built-in temp sensor delivers up to 60o of fish detection area with high sensitivity settings - Operates at boat speeds up to 70 mph (61 kts) - Variety of other transducer purchase options available Trolling speed and distance log readings available with purchase of an optional sensor Adjustable ping speed with automatic HyperScrollTM to display fish targets at higher boat speeds Choice of six color display modes to match outdoor light conditions, and to help reveal fish hidden in underwater cover FasTrackTM vertical bar flasher displays real-time sonar returns and relative strength of each target Advanced Signal Processing (ASPTM) automatically adjusts your settings for the best sonar picture COLORLINETM separates fish from nearby structure and bottom, and helps define bottom composition and hardness Advanced Fish I.D.TM shows underwater targets in different sizes of fish symbols FishTrackTM displays target depth readings above fish symbols Surface water temperature readings come from a built-in temp sensor in the transducer Zoom with zoom bottom tracking and easy zoom-in/out control Selective on/off sonar alarms: Shallow, Deep, Fish and Zone Recording: Waterproof card slot for one MMC/SD memory card (not included) to record sonar graphs and GPS data files, and to load high-detail electronic chart options for nav display Compatible with optional plug-and-play Lowrance FreedomMapsTM, Fishing Hot Spots Elite, LakeMaster Pro Maps, NauticPathTM Coastal, and Navionics electronic charts on MMC/SD cards GPS+WAAS: Built-in, 12-parallel channel GPS+WAAS antenna WAAS-enabled for enhanced position accuracy to 3 m (under 10 ft) at select locations Custom, built-in background map with enhanced continental U.S. and Hawaii detail including over 60,000 nav aids and 10,000 wrecks and obstructions in coastal and Great Lakes waters, as well as interstate exit services, and more inland navigation features Optional GPS Mapping Accessories Pack with MapCreateTM CD software, one digital media card, and an MMC/SD card reader/writer that: Lets you create unlimited, custom, detailed maps on reusable digital media cards (MMC/SD) Includes unique, searchable database of streets, addresses, and over 2,000,000 Point-of-Interest (POI) to easily find/identify marinas, fuel, restaurants, hotels, airports, emergency services, and more Saves up to 1,000 waypoints, 1,000 event markers, and 100 routes (up to 100 waypoints/route) 100 savable plot trails with up to 10,000 points per trail 42 graphic icons to mark your favorite spots 40 map zoom ranges - from 0.02 to 4,000 miles - with easy zoom-in/out control High-speed screen updates Performance: Internal back-up memory keeps stored GPS data and sonar settings safe and accessible for years Rugged, reliable, completely sealed and waterproof casing, even for use in harsh saltwater environments Full one-year warranty * Actual depth capabilities depend on transducer configuration and installation, bottom composition and water conditions. All sonar units typically read deeper in fresh water than salt water.