There are people who buy boats but there are also people who build them, why not build your own electronics too? OpenPlotter is a combination of software and hardware to be used as navigational aid on small and medium boats. It is also a complete home automation system onboard. It works on ARM computers like the Raspberry Pi and is open-source, low-cost and low-consumption. Its design is modular, so you just have to implement what your boat needs. Do it yourself.

https://www.gitbook.com/book/sailoog/openplotter-documentation/details

http://www.sailoog.com/openplotter

https://github.com/sailoog/openplotter/wiki