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  1. #1
    Senior Member calves2997's Avatar
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    Garmin 705: Speed 77.8 mph. wtf?

    I have a Garmin 705 that I absolutely love. However, since updating my Powertap to ant + and transmitting power/cadence data to the device, it occasionally reads very high speeds, then corrects. No other data transmission errors, power, cadence and heart rate are all OK. I also have the garmin cadence sensor on the bike.
    Do you think that it is double counting the information from the cadence sensor and powertap?
    Any help is appreciated.

  2. #2
    Senior Member
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    Once you move to using the PT the Edge gets the speed data from the PT and not the GSC10. It continues to get the cadence only from the GSC10. There is a bug however, if you have the GPS turned off and the wheel calibration set to auto it will get the speed from BOTH thus causing double speed ALL the time.

    Not sure about the speed spikes though. How old is your battery in the PT?

  3. #3
    Senior Member calves2997's Avatar
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    The battery has about 2000 miles, but most of those are done in the Cleveland cold. And I have the wheel diameter set to auto but I have the GPS on. Maybe I'll start by changing the PT battery.
    Thanks

  4. #4
    Senior Member mridan's Avatar
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    Quote Originally Posted by calves2997 View Post
    The battery has about 2000 miles, but most of those are done in the Cleveland cold. And I have the wheel diameter set to auto but I have the GPS on. Maybe I'll start by changing the PT battery.
    Thanks
    Set wheel diameter to manual and enter tire size.
    ie 700x23c enter 2096
    This should take care of your problem
    page 63-64 in 705 manual has wheel size chart,also see page 8 to enter number.

  5. #5
    Just a student norsehabanero's Avatar
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    i have a garmin vista and everyonce in a while i get the same thing, a very high max speed, not sure why, maybe a gps thing?????? or a garmin thing
    http://www.thebicyclingguitarist.net.../bios/bike.gif about to start winter quarter , enjoying school so far

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