Empathy List Archives

MS

Mark Sims

Thu, Jun 9, 2016 4:56 PM

You have to be careful with a lot of modern GPS receivers. Many implement some sort of "position pinning". If they do not detect significant movement, they either stop updating the coordinates or heavily filter it... you do not see the actual computed location. On some receivers you have to move well over 10 meters before the position un-pins.

CEP(95) of 1.5 meters over 1,000 seconds.

You have to be careful with a lot of modern GPS receivers. Many implement some sort of "position pinning". If they do not detect significant movement, they either stop updating the coordinates or heavily filter it... you do not see the actual computed location. On some receivers you have to move well over 10 meters before the position un-pins. ---------------------- > CEP(95) of 1.5 meters over 1,000 seconds.

VH

Van Horn, David

Thu, Jun 9, 2016 5:05 PM

Using the thunderbolt here.

I only asked because a co-worker spotted the altitude and thought it was "wrong" for boulder.

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark Sims
Sent: Thursday, June 9, 2016 10:56 AM
To: time-nuts@febo.com
Subject: [time-nuts] GPS altitude somewhat wrong?

You have to be careful with a lot of modern GPS receivers. Many implement some sort of "position pinning". If they do not detect significant movement, they either stop updating the coordinates or heavily filter it... you do not see the actual computed location. On some receivers you have to move well over 10 meters before the position un-pins.

CEP(95) of 1.5 meters over 1,000 seconds.

time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Using the thunderbolt here. I only asked because a co-worker spotted the altitude and thought it was "wrong" for boulder. -----Original Message----- From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark Sims Sent: Thursday, June 9, 2016 10:56 AM To: time-nuts@febo.com Subject: [time-nuts] GPS altitude somewhat wrong? You have to be careful with a lot of modern GPS receivers. Many implement some sort of "position pinning". If they do not detect significant movement, they either stop updating the coordinates or heavily filter it... you do not see the actual computed location. On some receivers you have to move well over 10 meters before the position un-pins. ---------------------- > CEP(95) of 1.5 meters over 1,000 seconds. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

GE

Gary E. Miller

Thu, Jun 9, 2016 5:23 PM

Yo Mark!

On Thu, 9 Jun 2016 16:56:12 +0000
Mark Sims holrum@hotmail.com wrote:

You have to be careful with a lot of modern GPS receivers. Many
implement some sort of "position pinning". If they do not detect
significant movement, they either stop updating the coordinates or
heavily filter it... you do not see the actual computed location.
On some receivers you have to move well over 10 meters before the
position un-pins. ----------------------

CEP(95) of 1.5 meters over 1,000 seconds.

Yes, but this model Skytraq is designed for survey work. So that mode
is selectable.

RGDS
GARY

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588

Yo Mark! On Thu, 9 Jun 2016 16:56:12 +0000 Mark Sims <holrum@hotmail.com> wrote: > You have to be careful with a lot of modern GPS receivers. Many > implement some sort of "position pinning". If they do not detect > significant movement, they either stop updating the coordinates or > heavily filter it... you do not see the actual computed location. > On some receivers you have to move well over 10 meters before the > position un-pins. ---------------------- > > CEP(95) of 1.5 meters over 1,000 seconds. Yes, but this model Skytraq is designed for survey work. So that mode is selectable. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 gem@rellim.com Tel:+1 541 382 8588

time-nuts@lists.febo.com

GPS altitude somewhat wrong?

RGDS GARY

RGDS
GARY