The 6.4 in/16.3 cm display with LED backlight provides an easy-to-view, two-panel splitscreen – for example, with chart and Broadband Sounder™ – all at a more affordable price. Plus, HDS-7 offers the added option of a three-window view. 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 One waterproof SD card slot to load high-detail charting options. 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.