Ok, so I figured out what I was doing wrong on the trail the other day. There are "points of interest" along the trail clearly marked with "1" and "2." Only those aren't the mile markers. *sigh* So Nike+ is giving me extra credit today because I calibrated it wrong yesterday.
I actually walked 2.5 miles today. And boy, was it windy! And muddy!
I should get my Nike+ laces sock before Saturday (next planned workout day), so I'll just wait on the calibration until then.