I've used mine for my case, you can get Ride Viewer (ver 1.4) which shows you all the data in tabular format, and it shows the bike stationery.
Strava and Garmin Connect will also show an overlay of where you are on the road, via google earth, but ride viewer will say how long stationery etc.
It showed my at 13mph when the car hit me, and then the bike was flung some distance and was on the floor for 30 minutes (also shows elevation).
PS GMP will do bob all ! Report it for the sake of a 'reference number'.
I hope you are OK ?