I recently upgraded from a forerunner 35 to Vivoactive 3 but its recording of distance and pace seems way off the forerunner.
The guy I run with also has the forerunner and some of the differences even though we ran together were as follows.
FR35 - DIST 3.69miles, 8.29per mile
VIVO - DIST 3.58miles 8.45per mile
I started wearing both watches on a few runs and they are all out.
I contacted Garmin who simply sent a link about GPS drift but that only covers being a few meters out not a 1/10 of a mile and 15secs plus a mile.
Any suggestions welcome