The 520s has a worldwide basemap, the 530s is preloaded with U.S. inland lakes data and the 540s is preloaded with marine maps for all U.S. coastal areas, including Alaska and Hawaii.

Plotter/fishfinder combo features UltraScroll? updates, Auto Guidance and CANet? sonar-sharing technology. The built-in sounder can scan as deep as 1500' (with dual frequency transducer) to clearly paint depth contours, fish targets, structure, etc. And available Auto Guidance capability shows you which way to navigate with graphical onscreen steering cues. An SD card slot allows the easy plug in of additional map areas or software features. The 520s has a worldwide basmap. The 530s is preloaded with U.S. inland lakes data and the 540s is preloaded with marine maps for all U.S. coastal areas, including Alaska and Hawaii.