Played with that app... it sucks. Went digging
https://developer.garmin.com/fit/fitcsvtool/
*edit*
Playing around with it, and it would *appear* to just shit out random garbage for the velocity, however its not garbage. Looking through the code of the other converter I see an extra step taking the values from column H and dividing by 304.8 which gives the actual velocity number.
Trying to dig through docs to see why its represented this way but thats the math.
https://developer.garmin.com/fit/fitcsvtool/
*edit*
Playing around with it, and it would *appear* to just shit out random garbage for the velocity, however its not garbage. Looking through the code of the other converter I see an extra step taking the values from column H and dividing by 304.8 which gives the actual velocity number.
Trying to dig through docs to see why its represented this way but thats the math.