Documentation for fields in Activity Messages? Specifically GPS

Hi,
I managed to decode my first Activity FIT File and am now looking at the different messages and their values. Most of them are self explaining, but some I don't understand. Is there a proper documentation of all the different fields in every kind of message? I can't find anything in the java doc or anywhere else. Specifically I don't understand the format of the PositionLongFieldNum and PositionLatFieldNum in a RecordMesg. I get for example 626181999 and 159880894 for one of my activities. I assumed it might be converted from 62.618, 15.9880 but this location is somewhere in Sweden and the Activity was in Germany. Since I see that the location was tracked accurately in other services, I'm wondering, what format this is and how I can convert it? Is there a documentation of all those fields somewhere?

Best,
Jens

0 Jens over 3 years ago

Ah, of course a minute after posting this, I found out that it's stored as "semicircles". This is described in the java doc of GpsMetadataMesg. I guess I'll find out how to convert this, nevertheless a place with some documentation of all the fields in the different types of messages would still be very helpful!

0 Jens over 3 years ago in reply to Jens

If somebody stumbles upon this question and is looking for GPS-conversion. This works for me:

val d = sc * (180.0 / 2.0.pow(31))

Where sc is the semicircle value. (I found this solution here: https://www.gps-forums.com/threads/accuracy-of-converting-semicircles-to-degrees.31488/ )