> The progression increases to generate values like 66, 660, 5280 7920, all values that form the "11" navigational system with a mile of 5280'.<p>Flawed premise: the modern mile being 5280' is more or less an historical accident. The Roman mile was 5000 Roman feet.<p><a href="https://petersmagnusson.org/2009/09/15/why-are-there-5280-feet-in-a-mile/" rel="nofollow">https://petersmagnusson.org/2009/09/15/why-are-there-5280-fe...</a>