garmin 500

gubber12345
gubber12345 Posts: 493
edited February 2014 in Road general
was out this morning in a brutal wind and started to notice on my garmin which I thought wasn't correct info on the screen i.e speed didn't seem right and I know the wind was definitely affecting the altimeter as I was actually climbing into a headwind and the percentage reading was telling me I was going down hill.now I know the pressure for the weather will affect the altimeter but would it affect the speed/cadence sensor(cant really see how it could TBH)

which reading does the garmin use to calculate speed if I have a speed/cadence sensor on or does it use the GPS to calculate it?

sometimes it said I was doing 18mph but it certainly didn't feel like it,so is it me or the garmin? anybody else found this when out in this type of weather?
Lapierre Aircode 300
Merida

Comments

  • Grill
    Grill Posts: 5,610
    Speed/cadence sensor always takes precedence over GPS.
    English Cycles V3 | Cervelo P5 | Cervelo T4 | Trek Domane Koppenberg
  • gubber12345
    gubber12345 Posts: 493
    Grill wrote:
    Speed/cadence sensor always takes precedence over GPS.
    Cheers grill
    Lapierre Aircode 300
    Merida
  • chris_bass
    chris_bass Posts: 4,913
    have you set the wheel size correctly? if you set it to auto it will work it out from the gps signal.

    on a side note below is the elevation from last nights turbo session, was near an open window and the wind was incredible (was great for cooling me down though!). just shows how dodgy the elevation gain/loss is on these

    _20140215_202958.JPG
    www.conjunctivitis.com - a site for sore eyes
  • smoggysteve
    smoggysteve Posts: 2,909
    Grill wrote:
    Speed/cadence sensor always takes precedence over GPS.

    Not stricktly true. in the setup menu if you set wheel size to auto it uses the gps to calibrate the wheel size so it is not therefore taking precedence. it only does if the signal is lost.
  • gubber12345
    gubber12345 Posts: 493
    Ok I have it set to manual at 2096mm.

    never had to doubt it before it just didnt feel right yesterday at all. Which is more accurate..gps or wheel sensor or is it of no consequence?
    Lapierre Aircode 300
    Merida
  • wongataa
    wongataa Posts: 1,001
    gubber12345 wrote:
    Ok I have it set to manual at 2096mm.

    never had to doubt it before it just didnt feel right yesterday at all. Which is more accurate..gps or wheel sensor or is it of no consequence?
    If you set the correct wheel size manually it should be a bit more accurate than the GPS as there is no GPS position drift to worry about.

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