DrDepth is described as '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!' and is an app in the travel & location category. There are seven alternatives to DrDepth for a variety of platforms, including iPhone, iPad, Android, Windows and Web-based apps. The best DrDepth alternative is UnderSee Explorer. It's not free, so if you're looking for a free alternative, you could try UnderSee Explorer or Anchorages: The Cruising Guide. Other great apps like DrDepth are Lake Monster - Lake Weather, Wavve Boating-Easy Marine GPS, OpenPlotter and Aqua Map.