I recently received a GPS for my bicycle, but not made by Garmin. I regularly ride 14.4 miles. The GPS logged it at 13.45 miles. I have plotted the route with Bikely.com and a couple of odometers. All of them are real close to 14.4 miles. I have read an article about things that cause a GPS to vary in accuracy. Has anyone else had the experience of a GPS giving a trip mileage different from that indicated by other quite reliable means?