Activity.Info.elapsedDistance is way off not only due to lat/lon = [0.0, 0.0]
https://forums.garmin.com/developer/connect-iq/i/bug-reports/initial-values-lat-lon-0-0-if-replaying-a-fit-in-simulator
but rather it seems there are more bugs in the sim.
info.elapsedDistance should be the sum of the distances between the recorded position points lat/lon. So I've calculated the sum of this distance increments and compared it to the value of info.elapsedDistance. I've only used a fast and easy formula to calculate the distances between 2 position points without any smoothing or interpolation. Thus my calculated elapsed distance may differ somewhat to info.elapsedDistance.
By replaying a .fit I get the following values
My sum of distance increments = 125.82m
Activity.info.elapsedDistance = 194.69m
This is a difference of >54% which is well way off.
In the .tcx file of the .fit for the same lat/lon there is stored the value
<DistanceMeters>123.29000091552734</DistanceMeters>
If I don't use the "Playback File" option but instead use the option "Simulate Data" I get this values
My sum of distance increments = 124.67m
Activity.info.elapsedDistance = 129.09m
This is a difference 3.5% that seems to be reasonable to me.
Since "Simulate Data" generates random values the distances are different to the "Playback File" values.
