Garmin 705 + Powertap + auto-calibrate?

AndyRubio
AndyRubio Posts: 880
Hi,

I've got a Powertap hub talking to my Garmin 705 through the magic of ANT+.

But I don't know how to calibrate the Garmin. I could do it with the Powertap computer but there aren't any instructions with the Garmin.

* When I click on Calibrate, I'm taken to a screen that shows that the device is 'calibrating....' but that process doesn't seem to end.

* There's a box which is ticked called 'Auto-calibrate'. What hapens if I don't tick it?

* There are some dashed lines which I believe can display a number. What's that? No number on mine.

Nonetheless I get power displayed which are pretty much what I'd expect. I haven't get compared these figures to a freshly calibrated Powertap computer yet. But I'm hoping one of you lovely folk can help me out here.

Important:
I've searched for the answer but can't find it, here and elsewhere. I also emailed both Garmin and Cyclops / Saris and neither of their respondants could (or in reality: would) answer this question.

Much appreciated!

Cheers,
Andy

Comments

  • Anonymous
    Anonymous Posts: 79,667
    Make sure the Garmin is reading the PT.
    Come to a stop.
    Do the calibrate.
    Eventually some numbers should come up (something like -23486 or whatever) and it'll say calibration success.
    Have a ride.
    Make sure you do it every ride as it does wander off a bit if you don't (as I found to my disgruntlement...)
  • AndyRubio
    AndyRubio Posts: 880
    Aha so you click on 'Calibrate' while stationary?

    Should 'Auto-calibrate' be ticked?
  • Anonymous
    Anonymous Posts: 79,667
    AndyRubio wrote:
    Aha so you click on 'Calibrate' while stationary?

    Should 'Auto-calibrate' be ticked?

    Yes.

    Yes.
  • AndyRubio
    AndyRubio Posts: 880
    Nice one thanks!