Segment point messages form the track of a segment. Each one also tells how long each leader needed to reach it, so that the device can show the gap in real time.
messageIndexStringIndex of the message among the messages of the same kind in the file, starting at 0. Other messages use it to reference this one.
Latitude. FIT stores coordinates as semicircles: multiply by 180 / 2^31 to get degrees.
Longitude. FIT stores coordinates as semicircles: multiply by 180 / 2^31 to get degrees.
Distance from the start of the segment to the point.
altitudeFloat64Altitude of the point.
Time each leader needed to reach the point from the start of the segment.
Altitude of the point, with a larger range than altitude.
mesgNumStringGlobal message number identifying the kind of message. Decoders use it to know which profile to apply to the data.