Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-03-14, 12:44 AM   #1
Chris516
24-Speed Machine
Thread Starter
 
Chris516's Avatar
 
Join Date: Jul 2004
Location: Wash. Grove, MD
Bikes: 2003 Specialized Allez 24-Speed Road Bike
Posts: 6,054
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garmin Edge 500 w/ HRM + Cadence Sensor

I have noticed sometimes, when staying in one position, that the speedometer will think I am still moving. .1-.3mph sometimes.
Chris516 is offline   Reply With Quote
Old 01-03-14, 06:42 AM   #2
Athens80
Senior Member
 
Join Date: Aug 2007
Bikes:
Posts: 828
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sports GPS devices not (generally?) precise enough to locate your position on Earth to the nearest foot. Trees, buildings or other obstacles between you and one or more of the satellites will reduce the precision. If it estimates your position at X one moment and X+10' three seconds later, that change in estimated position results in speed greater than zero. That sort of drift is usually irrelevant to your sporting purposes.

In your settings you have the option to have the recording pause when you're stopped, or your speed is below a custom level. Using that will filter out that drift while you're stopped, at least in the GPS recording.

With respect to the additional sensor -- be sure that you are paired to use the cadence/speed sensor for speed.
Athens80 is offline   Reply With Quote
Old 01-03-14, 07:40 AM   #3
Aushiker
Senior Member
 
Aushiker's Avatar
 
Join Date: Jun 2007
Location: Fremantle, Western Australia
Bikes: Surly Long Haul Trucker, Salsa Mukluk, Giant Defy
Posts: 1,002
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
As Athens80 said ... I find having it set to pause when stopped pretty much gets rid of this problem.

Andrew
Aushiker is offline   Reply With Quote
Old 01-03-14, 01:27 PM   #4
Looigi
Senior Member
 
Looigi's Avatar
 
Join Date: Dec 2010
Bikes:
Posts: 8,943
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes. It's a fundamental limitation of the precision of the GPS itself. There's a error in position and it drifts over time. Movement over time translate into a speed. It can be up to several MPH and enough to trigger the auto-pause if moving at slow speed or un-pause it when stopped. Garmin provides for a wheel sensor because it can help improve this, among other things.
Looigi is offline   Reply With Quote
Old 01-03-14, 04:16 PM   #5
Chris516
24-Speed Machine
Thread Starter
 
Chris516's Avatar
 
Join Date: Jul 2004
Location: Wash. Grove, MD
Bikes: 2003 Specialized Allez 24-Speed Road Bike
Posts: 6,054
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks to all of you.

I am glad it is not an electronic malfunction.
Chris516 is offline   Reply With Quote
Old 01-03-14, 05:28 PM   #6
cafzali
Senior Member
 
Join Date: May 2012
Location: Rockland County, NY
Bikes: Giant TCR SL3 and Trek 1.5
Posts: 1,282
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Chris516 View Post
Thanks to all of you.

I am glad it is not an electronic malfunction.
If you set the Edge to pull your speed and distance from your cadence sensor, it will fix that problem. There will be a noticeable lag if you're pulling speed from a satellite array.
cafzali is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:27 AM.