| View previous topic :: View next topic |
| Author |
Message |
Gawdo
Occasional Visitor
Joined: Oct 04, 2004
Posts: 4
|
 Posted: Fri Oct 08, 2004 2:32 am Post subject: Leadtek 9532 Altitude Calibration/Deviation |
 |
|
I have the Leadtek 9532 and I was curious about it constantly claiming the altitude (at sea level while standing on the boat ramp) is 75M above sea level.
I have usually 8-10 satellites so I can only assume that the leadtek has an initial calibration or the satellites dont like the thicker equator or some garbage (hey I know, grasping at straws).
Any ideas would be great, thanks. |
|
| Back to top |
|
 |
lbendlin
Pocket GPS Staff
Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA
|
| Posted: Sun Oct 10, 2004 2:35 am Post subject: |
|
|
This is a common error of the chipset that is used by the Leadtek receiver (SiRF II) - it also affects a whole bunch o fother receivers. Either live with it or get yourself a program that can correct this error on the software side.
_________________
Lutz
Report Map Errors here:
TomTom/TeleAtlas NAVTEQ |
|
| Back to top |
|
|
Gawdo
Occasional Visitor
Joined: Oct 04, 2004
Posts: 4
|
| Posted: Mon Oct 11, 2004 7:33 am Post subject: |
|
|
| Ahh, Ok thanks for that. |
|
| Back to top |
|
|
nigelp
Occasional Visitor
Joined: Feb 22, 2005
Posts: 40
|
| Posted: Mon Mar 07, 2005 1:17 pm Post subject: |
|
|
Do you know what software can be used to correct this error.
I go geocaching and was looking at the 9537, but if it isnt that accurate, maybe i`ll pass. |
|
| Back to top |
|
|
Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
|
| Posted: Mon Mar 07, 2005 1:50 pm Post subject: |
|
|
| nigelp wrote: | Do you know what software can be used to correct this error.
I go geocaching and was looking at the 9537, but if it isnt that accurate, maybe i`ll pass. |
Watch out, lots of recievers use the SiRF chipset (most of the Bluetooth receivers) and they have exactly the same problem. The height is not all that accurate either, typically it is 1.5 to 2 times worse than the horizontal position.
The error is in height, not lat/long so it shouldn't cause too much problem with geocaching.
What happens is that the world is not perfectly round and mean sea level varies in different parts of the world. In the NMEA data provided by the GPS, there is supposed to be an uncorrected and a corrected height. SiRF chipsets don't report this correctly - it's been a long standing bug.
It is technically possible for a third party program to correct the error manually by applying a correction factor to the raw data. I am sure there are programs which will do this for you, but I don't know of any specifically.
_________________
Gone fishing! |
|
| Back to top |
|
|
nigelp
Occasional Visitor
Joined: Feb 22, 2005
Posts: 40
|
| Posted: Mon Mar 07, 2005 1:58 pm Post subject: |
|
|
the height isnt a problem for me at all. Just the Lat and Long.
Are they pretty accurate? I was thinking of the BT GPS from either Leadtek, Holux or SysonChip.
However, I think they will all have the problem you describe.
I see from your sig you have a dedicated GPS and Holux GPS, if you look at the lat / long from the holux, does it report the same lat / long as your GPS if they are sat next to each other? |
|
| Back to top |
|
|
|
![]() Posted: Today Post subject: Pocket GPS Advertising |
|
|
We see you’re using an ad-blocker. We’re fine with that and won’t stop you visiting the site.
Have you considered making a donation towards website running costs?. Or you could disable your ad-blocker for this site. We think you’ll find our adverts are not overbearing!
|
|
| Back to top |
|
|
|
Forum FAQ
Search
Usergroups
Profile
Log in for private messages
Log in
