The Garmin 400 and 500 range are supplied as standard by Garmin with an internal antenna. They have the facility to take the Garmin GA29 external antenna if required. To order a GA29 antenna please check the accessories section on this page. This unit is preloaded with a UK and Ireland BlueChart marine chart. For mariners with a keen eye for value, this versatile chartplotter delivers a lot of navigation for the money. It features a bright 5” QVGA colour display, satellite-enhanced worldwide basemap imagery, and an SD card slot that makes it easy to add features with the optional BlueChart® g2 Vision card. Like all Garmin plotters, these utilize WAAS/EGNOS-enabled GPS receivers for extreme high accuracy (typically within 3 meters). The 550 includes detailed offshore maps with Bluechart coverage for the UK. See detail-rich imagery like never before The 550 worldwide basemap can be enhanced with the optional BlueChart® g2 Vision card, which provides high-resolution aerial reference photos for help navigating tricky harbours and channels — or locating spots like area marinas, fuel stops or restaurants. The g2 Vision plug-in data card also allows the GPSMAP 550 to graphically depict a true 3D “mariner’s eye” topside view or “fish eye” underwater navigation perspective. Experience super simple user interface for easy operation With fewer buttons to push and fewer operational steps to navigate, the GPSMAP 550’s simplified menu format makes it easy for you to see and select the data you want to access on-screen. Simplify navigation with Auto Guidance using G2 Vision Optional auto guidance technology will help simplify your navigation. It’s like having a knowledgeable guide to local hazards and waterways always on deck. Auto Guidance searches all the chart features to suggest the best known charted routes for navigation. Enjoy added functionality of sonar The 550s can combine with powerful dual frequency or dual beam sonar to clearly paint depth contours, fish targets, structure, etc. It’s also CANet™ capable, allowing sounder data to be shared with other plotter displays on your boat Features Ultra-bright 5" diagonal QVGA display, 320 x 240 pixels – 800 nits of brightness New streamlined user interface offers easy selection of modes and features Preloaded with marine map detail of the UK & Ireland plus a worldwide satellite imagery internal map Single SD memory card slot for optional BlueChart G2 VISION cards BlueChart G2 VISION cards provide: - High-resolution satellite imagery which can be overlaid on the basemap - 3D charting information for a true "mariner’s eye view" perspective - 3D perspective below the water line for displaying bathymetry in a "fish eye view" - Auto guidance technology suggests the best course to a destination - Navigationally significant aerial photographs - Coastal roads and points of interest detail Built-in receiving antenna with remote antenna capability – BNC connector for optional GA29 antenna Backlit keypad for easier operation at night Two NMEA0183 I/O ports Unit dimensions: 6.4" W x 5.9" H x 2.9" New sounder design featuring excellent shallow water performance Depth: 1,500 feet (dual frequency), 900 feet (dual beam) Ultrascroll™ high rep rate sonar provides lightning-fast screen updates New AutoGain technology enhances target visibility CANet™ proprietary bus allows display and control of full feature sounder data on 2 nd Garmin chartplotter See-Thru® technology: shows weak and strong returns simultaneously Water temperature log graphically records water temp data Round flasher display mode (in dual beam mode) and A-scope (in dual frequency mode) 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 What you get GPSMAP 550s Unit cover Tilt/swivel mount Cables Owner's manual