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Run speed impossibly high

Former Member
Former Member over 15 years ago
I have a Forerunner 305. The timing graph shows impossibly high speeds for my run. The rate is around 2minutes/mile. It should be around 8 to 8:30. The average pace that is shown is correct and matches the average shown on the watch. When I export the data to a TCX file the speeds (which I am pretty sure are meters/sec) are still high. See two values below :

<ns3:Speed>18.635507599999997</ns3:Speed>
<ns3:Speed>8.341258999999999</ns3:Speed>

I am not sure if the problem is the data coming from the watch or Garmin Connect. I have also loaded the data on Training Center and it shows the same problem. This leads me to believe the problem is on the watch.

I have had the watch for a 10 days. My first two runs were fine - data displayed correctly. After installed the GSC-10 speed and cadence sensor for biking the problem seems to have shown up. I have the same impossibly high speeds on the bike data as well 49mph (wish I could bike that fast).

Any ideas on what the problem could be?

Appreciate the help.
  • Former Member
    0 Former Member over 15 years ago
    Inconsistent Speeds

    I wonder whether this is related to the general wide range of speeds on the chart. I can run a pretty consistent pace, yet the chart shows these constant wild swings from 7:00 to 11:00/mi. And then my "best pace" will be reported as 8:00+ or something (higher than the lowest swing). This is a pain, because I don't believe my time-per-range totals are accurate.

    ps Who is supposed to answer our questions? Other users, or Garmin admins? Help!
  • 0 over 15 years ago
    I would check that you have a decent satellite lock first before starting any activity.

    We set ours switched on and outside with a clear view of the sky while we do our final preparations. The devices are ready to go when the datafields show up. If there is an extended delay in locking on to satellites clear the cache by holding the down button when you turn it on.

    In our experience the devices best acquire satellites when stationary. Delays do occur if they are on wrists and moving around, even when outside.