Garmin GPSMAP 521S Dual Frequency Combo

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Features an ultra-bright 5" QVGA display along with an improved high-speed digital design for faster map drawing and panning speeds. Plus, these waterproof units have a high-sensitivity internal GPS receiver, so mariners will always know their position at sea. It's ready to go with a built-in, satellite enhanced worldwide basemap and Garmin's proven easy-to-use interface designed to help mariners navigate the open waters with ease.

Features and Specifications:

• Ultra-bright 5" diagonal QVGA display, 240 x 320 pixels - over 800 nits of brightness
  
• NMEA 2000 certified for seamless integration with the Garmin marine lineup
  
• Preloaded worldwide marine basemap
  
• Compatible with GXM 51 for XM Satellite Radio and XM WX Satellite Weather
  
• Built-in high-sensitivity GPS receiver
  
• High-speed processor for fast screen redraws and smooth panning
  
• Streamlined user interface makes it simple to select modes and features
  
• Single SD memory card slot for BlueChart g2 Vision cards, as well as saving waypoints, routes and tracks to an SD card
  
• Optional BlueChart g2 Vision cards provide marine chart detail and enhanced navigation features like Auto Guidance, satellite imagery, 3-D Mariner's Eye View and 3-D Fish Eye View
  
• Backlit keypad for easy operation in low light conditions
  
• Unit dimensions: 5.9"H x6.4"W x 2.9"D
  
• Power output: 500 watts (RMS) 4000 watts (peak to peak), dual frequency
  
• Depth: 1500 feet/500 meters (dual beam)
  
• Use a dual frequency transducer 50 kHz (45 degrees), 200kHz (10 degrees) for maximum saltwater performance
  
• Patented transom/trolling mount transducer
  
• UltraScroll high rep rate sonar provides lightning-fast screen updates
  
• AutoGain technology enhances target visibility
  
• See-Thru technology shows weak and strong returns simultaneously
  
• Water temperature log graphically records water temp data
  
• A-scope
  
• Whiteline
  
• Adjustable depth line helps gauge desired fishing levels and bottom clearance
  
• Split zoom display offers a closer look at fish targets and bottom structure
  
• 2X, 4X, and bottomlock zoom
  
• Adjustable keel offset
  
• Alarms for fish size, shallow water, deep water, and low battery
  
• 1 Year Garmin Factory Warranty