The survey foot is going away soon, and not a moment too early. Having two feet with a mutual ratio of 499999/500000 seems rather confusing. But to be sure, the

The survey foot is going away soon, and not a moment too early. Having two feet with a mutual ratio of 499999/500000 seems rather confusing. But to be sure, the survey foot has apparently not been used much since 1986. https://www.nist.gov/pml/us-surveyfoot https://www.nist.gov/pml/us-surveyfoot