When uploading a track to BaseCamp the track length always shows as being longer than when I saved the track on my Oregon 450.
For example, I did a walk and my Oregon said I had done 4.5km, when I imported the GPX file into BaseCamp it said the track length was 4.7km.
I suspect that BaseCamp may be taking into account the elevation as well and the Oregon isn't, so BaseCamp is more accurate. Am I correct?