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Track Run Activity - Increasingly incorrect lap start and end points.

I am using my Garmin 265 on 400 meter standard track. 

Settings:

  • Lane 2 - I am running in lane 2..
  • Auto Distance - 400m
  • Auto Lap - by distance
  • GPS - All + Multi Band

Expected behavior

  • Each lap should start and end roughly at the same spot.

Real behavior 

  • Lap 1 usually is spot on. After that, each proceeding lap starts lagging behind 5-10 meters. (See the attached picture below) By the time I'm on 10th lap, I'm around 100 meters behind the first - (1) - circle in picture.

Question

  • What can I do to improve the accuracy? I am aware of the calibration and I've attempted it before. This is the second track that I've been having issues with.