It's a good intro. (It's a pain in the butt to dig the rest of this stuff up, but the iterations of the Detroit GP course are even more convoluted than what you show.)
1982: Downtown street circuit for F1 with an extension to a hairpin on Jefferson outside of where Turn 5 as shown on the map. Length- 2.590 miles.
1983-88: The downtown circuit for F1 shown in the first diagram of the intro post. Length- 2.500 miles.
1989-91: Downtown course for CART. Same as 1983-88, but no Turn 18-20 chicane. Length- 2.493 miles.
1992-97: Belle Isle short course. Length- 2.100 miles.
1998-01: Belle Isle long course. Length- 2.360 miles.
2007-08, '12: Belle Isle short course with tightened Turn 8. Length- 2.125 miles.
2013-14: Belle Isle long course with tightened Turns 3 and 7. Length- 2.385 miles.
2015-Present: Revised Belle Isle long course, now with the sweeper before Turn 7 eased. Length- 2.350 miles.
Hope that helps.
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