"I know some will dispute this and maybe it changed in last few years, but these regulations do not apply to US citizens in US owned craft."

that is my understanding as well.

We did get checked by Quetico rangers this year, but they never looked at equipment except to check for barbless hooks, and of course checked out our paperwork.   Likely it is just the Canadian outfitters that have to comply.

I just about guarantee that there isn't one person in a million who can throw a throwrope out much more than 20 or 30 feet - 50' is ridiculous.  I always carry one on river trips, and they can be handy to use to tie up your boat when its a long way from the shore to the nearest tree, but mine is 25' I think (or maybe 30', but no longer) - I have used it a few times to fish out swimmers, and I know I couldn't possibly throw one much more than 20' accurately.   The boats we rented for Bowron Lakes provided some really crappy 50' throw ropes with the cinch so crapped up with sand and gunk that they couldn't be deployed in an emergency - took me about 5 minutes to work one free to use to tie up a boat.