The Imperial system is actually not that odd, in terms of navigation it is better than the metric system. While the Metric system is better for smaller measurements, when it comes to large distances, the mile (Nautical Mile) is more accurate. 1 Nautical mile is one minute latitude/longitudinal of arc and is the equivalent of 1.15 miles (6072 feet) and 1.8 KM (1852 Meters).
I use both systems because of living in Europe, but overall I like the US Imperial better. The thing to know about the Imperial system is that, unlike the metric system which is based on decimals, the Imperial system is fractional. 1/4 a gallon is a quart, 1/8 is a pint, 1/16 is a cup, 1/128 is an ounce etc. (even easier if you know computer memory stuff lol.)
Even the Romans used miles
(which is like, 0.9 something standard miles)