I don't think there is a way of attaching PDF documents here on the forum but great that you provided a google drive link which I read with interest.
I'm not so sure that long passages of text work well with forums often writing long postings myself which sometimes garner little interest but I still attempt to do so in the spirit of radio.
It was interesting how you accommodate various licence free radio systems rather than a typical marine radio direction but had a few concerns regards pursuing a 'standardised' channel system. Before you know it everyone wants a channel to themselves and accordingly there will be self appointed 'police' requesting that such channels are kept clear.
With my own Amateur Radio pursuits I know that I could be talking to a friend of mine as he drives around and inadvertently he moves into someone elses reception range. This can lead to the typical 'this frequency is in use' exclamations and even though I don't hear them he apologises and communicates to me a new frequency to use.
Although a canal boat is much slower the possibility of moving into another legitimate users radio 'space' is still there and unlicensed radio systems are for all to enjoy. It's very easy to think on a personal usage level and even find fellow enthusiasts positive to the idea but there is invariably a much wider user base or audience to consider. Flexibility can often be key.
I know sometimes the radio airwaves can seem a little quiet to cause any undue problems but just like a disabled parking space can often be seen to be empty it doesn't mean just anyone can park in it.
Anyway, my tuppence but all very interesting nonetheless.
All the best,