Just to be clear and so there is no confusion, Ron's humorous remark of "54-40 or fight" is NOT a Canadian reference. It is in fact attributed to Polk in his run for president and he used it as an electioneering slogan regarding the Oregon territory/Canada border dispute. He never delivered on it as his resolution of the dispute was unsuccessful. Hence the 49th parallel for the past 170 years.
And BTW, rv8bldr's use of the 1:10 rule is quite valid and in wide use in determining many things related to Canada/US activities.