FWIW...I was perusing another sailing forum and dreaming about quitting my job and sailing the world on a 44' cat when I came across an open source chart plotter software called OpenCPN. It seems quite popular with the cruising community. They have windows, mac, android, and iphone/ipad versions. The tablet/phone versions don't have as much capability as the laptop versions, but it still seems pretty powerful. I downloaded the android version for my Samsung Tab3. Quite impressive! You can download just about any chart you can think of and it overlays it on a map. Using your built in GPS it will give you SOG and can record your tracks. It also has some route planning capability with way points and such.
The laptop versions are even more powerful and allow you to bring in your AIS and weather radar and layer those on top as well. It will even do weather routing based on you're desired destination, weather GRIBs, and boat performance characteristics. Looks like I've found my alternative to Navionics!
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