Ambiguity: Did I forget the N/S? Is it supposed to be +/-? Did I get Lat and Lon flipped? Is it decimal degrees or degrees minutes seconds? The decimal degrees

Ambiguity: Did I forget the N/S? Is it supposed to be +/-? Did I get Lat and Lon flipped? Is it decimal degrees or degrees minutes seconds? The decimal degrees vs DMS is the big one, by the way. Especially since it's not always obvious that it's one or the other. This is actually why the US military invented MGRS, which is a grid square reference (giving precision to 100km), then northing and easting coordinates (every pair of digits improves accuracy by 10x). And you may already be able to assume the map square, and give just the northing and easting numbers. Plus code is related, but instead of using northing and easting, it uses a 4x5 grid with alphanumeric ids, that then subdivide after getting your grid square, allowing change in precision just by truncation, instead of having to truncate the northing and easting values seperately. It's also slightly more compact, as the greater number base available compared to decimal allows less digits to be used, and therefore faster to write and communicate, especially over the phone.