Simon, these people were ambushed during one of the worst sand storms in history. I'm sure they did have at least one gps device, but roads do not run due north and south so it would be easy to become confused during a sandstorm. In fact they did discover their mistake, but it was too late.
GPS doesn't need the roads to run due N/S or E/W ... it tells you exactly where you are (well, to within 10ft or so) and which direction you should be going (assuming you know where you are supposed to be going).
I have never heard an official from the Pentagon quoted by the news media during all of this hype you alluded to, so I suspect it was for the most part media hype.
The pentagon released the film and the story I believe.
Apparently you, and others, are under the impression that a war can be fought without any mistakes or casualties. Maybe after armageddon.
On the contrary. I know mistakes can and will happen. It seems some other people cannot admit that this could ever happen though and that the military could ever do any wrong.
I'd have less problem believing politicians and generals if they told us when they got things wrong from time to time.