The HDS-10 Gen2 has intuitively simple operation through the combination of an easy-to-understand menu system, plus programmable soft keys for instant display of favorite page views. 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. 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 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.