Since the 17 version update my Instinct is off .03 miles per mile in distance measurement. This is according to two Garmin Zumos, my old Garmin Forerunner and the odometers on my 6 motor vehicles. Why has the Instinct lost its accuracy? I have been running on the same road for 15 years. The first mile was marked by an old dead cypress tree, as measured by my 3 Garmin Forerunners that I used for many years as well as 3 Garmin GPS devices, two Zumos and an E-Trex. When I first got the Instinct it was only about 30 feet beyond the this tree for one mile. Now it is a full.03 miles beyond.
