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Same course, different distance recorded

I have a 10km course saved to my 265s

i ran it 3 times this week - first it was 10.15km and second 10.75km

today I ran the same course and it only recorded as 9.7km? I can see the GPS recorded exactly the same as the previous 2 so I can’t understand how it lost half a km

0 e7andy over 1 year ago

Post links to the three activities so we can have a look.

0 8111333 over 1 year ago

run 1 - <iframe src='connect.garmin.com/.../14956670772' title='Base - Rowtown 10k' width='465' height='500' frameborder='0'></iframe>

run 2 - <iframe src='connect.garmin.com/.../14987222356' title='Rowtown 10k - self-paced base' width='465' height='500' frameborder='0'></iframe>

run 3 - <iframe src='connect.garmin.com/.../15050340846' title='Rowtown 10k with PacePro' width='465' height='500' frameborder='0'></iframe>

0 8111333 over 1 year ago in reply to e7andy

thank you, posted those

0 e7andy over 1 year ago in reply to 8111333

Wjen I converted each to a course I get pretty much the exact same distance for each course so the question is why the distance is that much different. It is a 10% difference between longest and shortest. Maybe the step counter in the HRM or watch made it different.

0 8111333 over 1 year ago in reply to e7andy

I forgot to wear my chest strap on run 1, but wore it on both run 2 and run 3, so they should be aligned no?