The 8.4 in/21.3 cm display is an excellent size to “Get The Whole Picture” by dividing the screen into three or four panels: chartplotter, Broadband Sounder™, engine and system data, and optional StructureScan® viewing – plus users get the added advantage of programmable softkeys. Two waterproof SD card slots to load high-detail charting options. Users can also and save sonar and navigational data, and upload future HDS® software feature updates. Available in a variety of transducer-pack options: 83/200 kHz for inland/freshwater uses. 50/200 kHz for deeper Great Lakes/coastal saltwater uses Also compatible with Airmar® in-hull or thru-hull transducers for up to 1 kW operation – for deeper, saltwater applications Two waterproof SD card slots to load high-detail charting options (see below). Users can also and save sonar and navigational data, and upload future HDS software feature updates. HDS built-in cartography options: Americas*: Enhanced U.S. basemap, or intuitive, life-like Insight USA™ mapping. Worldwide (non-Americas): Navionics® world background map All HDS models are fully compatible with third party mapping solutions including Insight HD and Fishing Hot Spots® PRO, as well as Navionics® Gold, Platinum and Platinum+ with TurboView® for the best possible chartplotter experience.