Open CPN for MacOSX
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Open CPN is an open source free software that is free to use, modify, distribute, etc. It is a bit difficult (for me) to use, but hey, it's free. I'm sure with some practice one can get through the learning curve, and the price is right! I am going to run it
simultaneously with my usual GPS NavX this winter so maybe by spring I can give advice if anyone needs help. It's software for the computer savvy and not user friendly like us Mac users are so used to.