Question about Garmin Edge 305 GPS Receiver

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Edge 305 giving inconsistent and inaccurate elevation readings. everything else is cool. any thoughts?

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Same for me very often.
I think this is due to starting a road without waiting long enough that sattelites are acquired.

In fact 3 sattellites allow to compute position, 4 are necessary to compute position plus altitude.

Accuracy of position and altitude is much better from 5 sattellites acquired.

So I advise to start your device OUTDOORS, in an open place (not near walls as it masks sattellites) and wait until screen automatically moves to run mode, meaning enough sattellites are acquired.
You will get better chances to have a good accuracy.

Also on Garmin connect site, when you load your ride, you can correct altitudes automatically using real maps.

Posted on Feb 23, 2011

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Posted on Jan 02, 2017

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Sorry to have to break (no pun intended) this to you, but I have had two units do this. Once this problem starts eventually the Elevation field will display and stay at 65616. The problem is with the barometric altimeter and cannot be fixed without sending the unit to Garmin. When you call Garmin technical support, they will have you do all sorts of resets - be patient - eventually they will concede that the unit is busted and give you an RMA. Both times this happened was after the unit got a little roughed up (one time dropped it, the other time was mountain bike tumble) - evidently the altimeter is the least robust part. Good luck.

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Question: My Edge or Forerunner 205/305 won't power on. Is there a soft reset that I can do?
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From the Garmin web site.
--------------------------------------------------------------------------------------------------------------------------------------------- Answer: If a Forerunner or Edge 205/305 is unable to power on, a soft reset can be performed to un-freeze it. This will not erase any user data and is most effective if the device is connected to the computer while performing the reset.
To reset the Forerunner or Edge 205/305:
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In addition, please make sure that the device has the latest software version

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3. On Edge 305, go to SYSTEM.
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That fixed my Edge 305 - cadence and speed do appear now.

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