I just found this NMEA 2K data logger that works with the SeatalkNG and NMEA 2000 networks. It's simple to install as it can plug straight into the network backbone.
You can download free software for Mac & PC to convert the log data into various formats including CSV, OpenSkipper, CanBoat and Signal K formats. The download includes some trip logs to play with.
For cruisers you can load your track up to a blog or fill in a logbook and racers can use the data to build your polars and analyse your race performance. It's just a case of finding or writing the software that can do what you want with the data.
It seems that it can be used to replay the data in realtime on a NMEA2000 network, but that seems to be more of a feature for shop displays.
I will check out some of the SW it works with to see if it is worth buying for my racing.
I'm fully obsessed with the planing of my trip from France to Greece no time for improvements this year
It will take no effort to install assuming you have the NMEA2K network and an available connection point. Just think how much data you will have to play with after your trip when you are at you computer at home over winter
btw: my chart plotter seems to record all my previous tracks e.g.. I need to delete them about once per years.. it should be just a case of finding a way to copy this tracks from the plotter to a computer or a sd card... thinking of this may a NMEA2K wify adapter and appropriate software should be enough..