I like Plus Codes/Open Location Code. It doesn’t require a database of words like w3w or a database of locations like mapcode. It also has a nice feature where codes that are closer together tend to have the same prefix, the more letters that match, the closer it is. So any code that begins with 86 is roughly in the the central timezone of the US. 85 is Mountain time, etc. The location you mentioned near Detroit is 86JRGJHQ+CX or 86JRGJHQ+ if you don’t need to be as precise

http://openlocationcode.com/