Garrison I measured the ground distance along the flight path from point 6 to impact. (I did this on the assumption that the BEA graphics are computer-generated from GPS data and are therefore precise.)
I do not think there are GPS data on the FDR.... BEA has had generated (extrapolate) a flightpath between the LKP (GPS) and crashplace (water surface over engine place on ground) from all other FDP datas
(speed...course...altitude...time all compared with the accelerations x/y/z...)
but all in all, your average datas will be +/- correct,
I wish nice hollydays to all here, tree weeks no forum-obsession!