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GPSMAP External Antenna w/ Dual Frequency Transom Mount Transducer The Sounder along with its counterpart, the GPSMAP give you the cartography you need to venture offshore. These versatile units come ready to launch with preloaded marine map detail utilizing the new BlueChart? g2 technology. Coverage is for U.S. coastal areas, including Alaska and Hawaii. Features include integrated mapping, 2D or 3D map perspective, tide and current data, improved IALA symbols, navaids, marinas, boat ramps, roads, and more. Both units accept preprogrammed data cards for loading additional map coverage of inland lakes or BlueChart? detail for other regions. And the GPSMAP built-in RMS sounder features Ultrascroll for high-speed screen updates, with the proprietary Garmin CANet bus enabling sounder display information to be shared with, and controlled from, another chartplotter on your boat.GPSMAP Sounder Features256-color TFT display, 4.0" H x 3.0" W, 5.0-inch diagonal, x pixels CCFL backlight for display and keypad Ultra-dim backlight for nighttime operation with user programmable levels for day and night Unit dimensions: 6.3" H x 6.3" W x 3.3" D external antenna, 7.1" H x 6.3" W x 3.1" D internal antenna Power output: watts RMS watts peak to peak, dual frequency watts RMS watts peak to peak, dual beam Depth: 1,500 feet dual frequency, feet dual beam Transom mount transducer: 45 degree, 15 degree, dual frequency 60 degree, 20 degree, dual beam Built-in, highly detailed BlueChart g2 marine cartography of the coastal United States including Alaska and Hawaii. This data provides detailed coastlines, shaded depth contours, navaids, port plans, wrecks, restricted areas, real-time tide and current information, and 3D perspective CANet proprietary bus allows display and control of full-feature sounder data supplied from Garmin sounder New sounder design featuring excellent shallow water performance Ultra scroll; user adjustable Adjustable range with automatic display re-scaling of picture See-Thru technology: shows weak and strong returns simultaneously Depth Control Grain DCG: automatically adjusts fishfinder sensitivity according to depth Power down backup of settings: customer settings are not lost when the unit is turned off Pre-loaded with over 15 user-interface languages Water temperature log and graph Round flasher display mode A-scope Whiteline Adjustable depth line 2X and 4X Automatic and manual zoom Water speed capable Odometer Adjustable keel offset Alarms for fish size, shallow water, deep water, and battery voltage Battery voltage indication Detailed fish arches. FREE Shipping Over $100, No Sales Tax