If you are seeing a consistent 15 yards/45 feet, your GPS sensitivity is on the far end of the normal accuracy range and it will be best to exchange it with the retail/online store within your return period.
"GPS receivers are accurate to within 15 meters (49 feet) 95% of the time. Generally, users will see accuracy within 5 to 10 meters (16 to 33 feet) under normal conditions."
