I have noticed that distance of an activity from my 955 shows a different amount depending on whether i view it on Garmin Connect or download the GPX file and view it on Base camp.
The trail run I did today shows a distance of 37.66 k on Garmin connect and 43.6 k on Base camp. That is around a 15% difference.
Looking closely at the two track maps, Garmin connect seems to cut the corners of the tracks resulting in a shorter distance. Base camp looks like a better track as the corners are much more rounded resulting a longer distance.
I have set my watch to record track points every second. This looks good on the GPX file, However the straight lines on Garmin connect look more like every 10-20 seconds thus cutting corners.
Has anyone else noticed this or can help.
Thanks.