GPS metadata message

GPS metadata messages store detailed GPS fixes, with sub-second timing, heading and velocity on each axis.

Fields

timestampDateTimes
Moment the message refers to, in UTC. FIT stores it as seconds since the FIT epoch (December 31, 1989, 00:00:00 UTC); decoders usually expose it as a regular date.
timestampMsUint16ms
Millisecond part of the timestamp, for sub-second precision.
positionLatSint32semicircles
Latitude. FIT stores coordinates as semicircles: multiply by 180 / 2^31 to get degrees.
positionLongSint32semicircles
Longitude. FIT stores coordinates as semicircles: multiply by 180 / 2^31 to get degrees.
enhancedAltitudeFloat64m
Altitude, with a larger range than the altitude field. Prefer it when present.
enhancedSpeedFloat64m/s
Speed, with a larger range than the speed field. Prefer it when present.
headingFloat64degrees
Direction of travel.
utcTimestampDateTimes
UTC time given by the GPS, to correlate it with the system time of the device.
velocityFloat64[]m/s
Velocity along longitude, latitude and altitude.
mesgNumString
Global message number identifying the kind of message. Decoders use it to know which profile to apply to the data.