We are told that GPS "interference" first started occurring around the Dallas – Fort Worth Metropolitan area of North Texas, and have since moved east, as well as to regions west of Waco.

One of the worst-hit areas for GPS interference is an area abutting Fort Hood, America's third-largest military base. (Related: Fort Hood has had a lot of strange activity occur there over the years.)

"Can't wait until someone figures out the source," wrote someone on Twitter in the hope that the culprit will soon be identified.

The following map shows the GPS interference hot spots: