Yea, the company I work for makes that software (TheCapn). We have a huge following from every walk of marine life...US Coast Guard, US Navy, other Navy's from around the world...lobster fisherman, cruise ships...you name it. they run us.
We also have a DNC/Vector version for the military. That's pretty neat, uses the military data and the program builds a chart based on data...not just a scan of a paperchart and overlays your position on it. Based on data, we can do more...for example, if you want us to shade any depth under 16 ft in red, we can...since we see the chart as data...not just an image. I could go on...!
We're as accurate as the GPS attached is. And the nice thing is we give you a full situational awareness...you SEE where on the chart you are, no guessing. Nice to have when visibility is zero