SealClear isn't the ultimate solution for a laptop
based chart plotter. However, it does have a lot going for it.
The program is free of charge.
It is well written and works
Domestic updated charts
are free of charge
You can integrate other NMEA 0183
boat instruments into the GUI.
What you can not do for free:
Obtain international charts
Have an intuitive piece of software
Have trouble free setup and installation
As they say, all things are a compromise. If Seaclear's list of features fit's your needs it's a very good plotter solution. It's accurate on displayed boat position (subject to NOAA chart accuracy) and has a very good, if basic, route
planner. However, if you plan to cruise
outside of the United States, or are computer challenged, it is not a solution you will want to consider.