My recollection from the time was that GPS mapping wasn't involved and, in fact, the Wikipedia article says: "Mrs. Kim told state police that they had used a paper road map, an account supported by the Oregon State Police, which reported that the Kims had used an official State of Oregon highway map. Mrs. Kim later recounted that, after they had been stuck for four days and were studying the map for help, both she and Mr. Kim noticed that a box in the corner of the map bore the message: "Not all Roads Advisable, Check Weather Conditions"."
The difference is you had to map your own route from the paper map. Now Google is suggesting the "best" route so its easy to blame this corporate entity and not the person who chose to follow instructions.
