Average Speed vs Average Overall Speed

jsl said:

Just looking at some of my activities on Garmin Connect, there's Avg. Speed and Avg. Moving Speed.  Avg. Speed includes stopped and moving time (ie Avg. Speed = total distance/total time). Avg. Moving Speed only considers time when you're moving (ie Avg. Moving Speed = total distance/moving time).

Without checking any activities (Note I have not used hike app for a long while, just walk app on my Fenixes, and walk app misses moving/stopped logics) I would define the formulae of these data fields differently from yours.

1)

"Avg. Moving Speed

The average speed when moving for the current activity."

Moving distance/Moving time

(NB: that is not the total distance, but only those meters which were covered when the speed was above the threshold, so when moving.
I wrote it assuming that the defintion by Garmin is correct. It might be it is not and the real calculation is different, and also in this case the normal Total distance is used in the nominator) 

2)

"Avg. Overall Speed

The average speed for the current activity, including both moving and stopped speeds."

Total distance/Elapsed time

(NB: Elapsed time includes not just the stopped time, but the paused time, too. So the definition of Avg. Overall Speed is not the best one, because Avg. Speed by definition includes both moving and stopped speeds. But the latter does not include  paused time.
Its definition should be written as "The average speed for the current activity, including both moving, stopped and paused speeds"

3)

"Avg. Speed

The average speed for the current activity."

Total distance/Total time

(NB: its definition should be written as "The average speed for the current activity, including both moving and stopped speeds")

Anyway the best definition in manuals and support articles would not be those descriptive sentences, but the formulae themselves!