No pdfs back then I think.
It's PFDs, BTW.
True. There were no PFDs back then, but McKenzie had the common sense
not to navigate the Fraser in full freshet.
Oh, and by the way, McKenzie never got to the LML. He only explored the upper reaches of the Fraser, never venturing south through the canyon into the LML.
Why? Because it was in-navigable!
Simon Fraser tried, but even he couldn't beat the river, so portaging was the order of the day.
Trust what more experienced and intelligent posters than both you and me have said above: Canoeing down the Fraser in full freshet is a death wish and only to be attempted by
the suicidal or (as is the case here)
the stupid. Your comment makes it sound as if you are condoning their stupidity, but I will give you the benefit of the doubt.
FTR, I am glad that the two twits survived, but I would seriously recommend them to undergo a vasectomy.