Garmin Approach S62 golf yardage distances inaccurate

My Garmin S62 golf yardage distances are inaccurate. Typically when I am at the tee box my S62 shows the distance to be around 20 to 30 yards short of the actual yardage. This level of inaccuracy reduces the closer I get to the hole but still remains inaccurate. I have tried multiple courses and it is the same.