Home PageFacebookRSS News Feed
PocketGPS
Web
SatNav,GPS,Navigation
Pocket GPS World - SatNavs | GPS | Speed Cameras: Forums

Pocket GPS World :: View topic - Location Jumps instead of Settling
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in for private messagesLog in for private messages   Log inLog in 

Location Jumps instead of Settling

 
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Memory-Map
View previous topic :: View next topic  
Author Message
donster22
Occasional Visitor


Joined: May 13, 2004
Posts: 18

PostPosted: Wed Feb 02, 2005 12:39 am    Post subject: Location Jumps instead of Settling Reply with quote

Hi

I am a keen geocacher and use MM for this purpose.

Recently I have found that my posiiton cannot be 100% relied upon which has shaken my confidence in what I thought was a very good bit of kit.

This evening I settled at a point and took a position reading. This reading then remiained the same for about 10 minutes with 8 satellites before suddenly jumping 250 ft away where it then settled again. The original location has been verified by a couple of other people but I am losing confidence MM. The same thing happened at the weekend.

Why might this have happened? Does anyone else have this problem?

I use a Holuz GR230 and the settings in MM are NMEA @ 4800 baud rate or 9600 - does it make a difference? Nothing else has changed and I haven't had this problem before I don't think.

Any ideas.

Cheers
Donster22
Back to top
View user's profile Send private message
lbendlin
Pocket GPS Staff
Pocket GPS Staff


Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA

PostPosted: Wed Feb 02, 2005 6:23 am    Post subject: Reply with quote

General accuracy without DGPS is about 10 to 15 meters, so some jumping around is to be expected. VisualGPS has some nice statistics for long time DOP verification.

250 feet is about 80 meters - too much for standard DOP. There may have been other factors like an electronic device nearby that is interfering - a poorly shielded microwave, or even a GPS jammer device, who knows. Do you have the same jumping around at other locations?

For a serial GPS you should use 4800 and for a BT receiver 38400.
_________________
Lutz

Report Map Errors here:
TomTom/TeleAtlas NAVTEQ
Back to top
View user's profile Send private message Send e-mail
Dottythe90
Occasional Visitor


Joined: Nov 12, 2004
Posts: 4

PostPosted: Fri Feb 04, 2005 2:30 pm    Post subject: Reply with quote

I've seen this too.

From my house where I've previously had a good solid location displayed, I now get the symptoms described by Donster22 - the location jumps around by around 50-80 yards and leaves a track on the screen.

Its only happened since Christmas - anything to do with the Indian Ocean earthquake ? Its supposed to have speeded up the earths rotation fractionally which won't help geo-synched satellites much.
Back to top
View user's profile Send private message







Posted: Today    Post subject: Pocket GPS Advertising

Back to top
Display posts from previous:   
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Memory-Map All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB 2.0.11 © 2001 phpBB Group
phpBB port v2.1 based on Tom Nitzschner's phpbb2.0.6 upgraded to phpBB 2.0.4 standalone was developed and tested by:
ArtificialIntel, ChatServ, mikem,
sixonetonoffun and Paul Laudanski (aka Zhen-Xjell).

Version 2.1 by Nuke Cops 2003 http://www.nukecops.com

Make a Donation



CamerAlert Database

Click here for the PocketGPSWorld.com Speed Camera Database

Download Speed Camera Database
20.114 (23 Nov 22)



WORLDWIDE SPEED CAMERA SPOTTERS WANTED!

Click here to submit camera positions to the PocketGPSWorld.com Speed Camera Database


12mth Subscriber memberships awarded every week for verified new camera reports!

Submit Speed Camera Locations Now


CamerAlert Apps



iOS QR Code






Android QR Code







Terms & Privacy


GPS Shopping