Love the GPS stories. My experience has been. When in a much traveled area they're pretty accurate, but common sense is still necessary. Where I live they're useless. The ID of the streets on street signs doesn't match the GPS. One street sign says Rd. 221, GPS says Crane Valley Road. Unless you already knew a lot about the area (in which case you probably don't need GPS), you'd never find Crane Valley Road.
Just a little saying I heard, "The difference between intermediate and advanced is the fudge factor." Sounds like there's a lot of advanced quilters on QB.