Casio 5057 Manual page 20

Average Speed Indication
Speed value
Stopwatch
second hand
300
250 350
200
150
100
50
0
Center dial hand
Average Speed
Indication
E-18
The stopwatch second hand will indicate the average
speed value after you stop an elapsed time measurement
or display a lap time. The center dial hand points to
SPEED (SPD) while the average speed is being indicated.
Stopping an Elapsed Time or Cumulative Elapsed
Time Measurement
Two seconds after you stop an elapsed time
measurement operation by pressing B, the stopwatch
second hand will indicate the speed for two seconds. After
that, the stopwatch second hand will move back to the
elapsed time seconds position.
Lap Time Measurement
Two seconds after you stop a lap time measurement
operation by pressing D, the stopwatch second hand will
indicate the speed for two seconds. After that, the
stopwatch second hand will move to the ongoing elasped
time operation.