damn, way to call me out.
seriously though, its common knowledge that any interstate with an odd number run's North and South, while even number's run East and West. When the direction's asked to take 71 to 75, then continue on 71S, I didnt question it. Then they said take 64 E for 170mi... I thought that was a bit odd. Luckily thats 64 meets 75 again in Lexington. Bascially a 2 hour detour.
As for Garmin, I'd rather spend that money on sattellite radio for my car and use a map. At least with that I'd use it more than once a month. Then again I used a map this time and look what happened.