UnderSee Explorer is described as 'software combines GPS and Sounder data to produce high definition contour charts in real time. Data can be exported or imported in several formats including GIS and CAD files' and is an app in the Online Services category. There are three alternatives to UnderSee Explorer for Windows, Windows Mobile and Android. The best alternative is CiBioBase. Other great apps like UnderSee Explorer are HYPACK (Paid) and DrDepth (Paid).
The CI BioBase System is a revolutionary bathymetric and aquatic vegetation mapping software that uses a combination of acoustic data collection with Lowrance™ HDS depth finders and powerful cloud computing.
The DrDepth software combines data from your sounder and your GPS to create accurate maps of your local waters. You can create map data and maps for your GPS or even bring a laptop or a Pocket PC onboard to get instantly updated maps of what's beneath your boat!