It really helps when the GPS is accurate when you go marking important locations you will later try to walk to. So, I marked the training center place in my GPS yesterday, and tried to use the GPS to get there this morning. After much walking I gave up and called the training guy and he came and picked me up.
I had marked the location right outside the door of the center, but in the GPS (as I found when I really got there) it was off by 650 meters.
So, now my feet hurt.