60 csx is moving while sitting on my desk

[Pxtyson]

Why does my 60csx log movement when it is motionless on my desk for awhile?

[bkrownd]

Why does my 60csx log movement when it is motionless on my desk for awhile?

 

Assuming you have reception, it shows you in a different place than you are now?

[+BlueDeuce]

Civilian gps accuracy is measured in feet not millimeters

 

It’s going to dance.

[Pxtyson]

it says that i have logged 80 meters in 20 minutes

[+TotemLake]

Your GPS is experiencing what was earlier termed as the bumble bee dance.

 

Even though you are sitting still, the geometric position of the satellites measuring your position are not. They are continuously moving requiring a new time signal to your position which must be recalculated. This is what your EPE (Estimated Position Error) is about.

[bkrownd]

it says that i have logged 80 meters in 20 minutes

 

It shows you 80 meters away from your known location?

Or are you talking about the odometer only? Please be specific.

[+pppingme]

Why does my 60csx log movement when it is motionless on my desk for awhile?

Are you in California? Is it showing your moving West?? Thats not good, hope you have your life jacket ready...

 

Seriously though, you said its on your desk, that probably means your not getting a good view of the sat's. As others have stated, because the sat's are constantly moving, and your recomputing your position based on that, some movement is normal, and its probably worse because your inside, and aren't getting "good geometry" with the sat's.

 

Ideally you should have sat's on different sides of you, but if your inside, they are probably all on one side (your near an east window, so most of the sat's you see are east of you). This makes for worse accuracy than normal

[+Team Trail Walker]

6.67 centimetres x 1200 seconds (calculation rate for sake of argument) = 80.4 Meters

 

Not too bad!

 

6 meters (3 meter EPE) x 1200 seconds = 7.2 kilometers (assuming worst case)

 

Ouch!

[+pdxmarathonman]

There has been a copious amount of discussion regarding the "wandering" that the unit does while sitting on a desk with great reception of the satellites.

The earlier descriptions of why are good ones, and the reason some others don't wander is because they do averaging by default which minimizes the variation.

[robertlipe]

It's a well discussed trait of that family of products. See the last two sections ("My Ghost" and "When in Roam") at http://www.mtgc.org/robertlipe/showdown/

[+BlueDeuce]

Are you in California? Is it showing your moving West?? Thats not good, hope you have your life jacket ready...

 

That was worth a good chuckle.

[Pxtyson]

okay guys i am just doing a test right now and in 3 min 17 seconds of sitting completely still on my desk with a 9m accuracy i have had it move at 4.9kmh and also moved 13m

[+GPSOkie]

okay guys i am just doing a test right now and in 3 min 17 seconds of sitting completely still on my desk with a 9m accuracy i have had it move at 4.9kmh and also moved 13m

 

If it is on your desk, I would assume that you are not getting the best reception. A more accurate test would be to set it outside with a clear view of most of the sky. It will still wander around a bit. That is normal. If it make 20-30 6 foot jumps over 30 minutes, it will add up quickly. But again, that is normal.

[robertlipe]

I've heard the "at your desk" point before. I've taken the 60csx outside with a nearly horizon-to-horizon view - and with and without an external antenna at that - and observed the same trait. These units simply don't do position averaging and if you set them perfectly still, its best guess of your position will jitter 6 feet this way and 7 feet that way and 8 feet that way every few seconds. Over your 30 minutes, that few feet of jitter adds up to a substantial distance.