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[Software] Sat Nav Altimeter
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Ape
 


Member Since: 09 Oct 2006
Location: Germany
Posts: 4

United Kingdom 2006 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

draughtsman wrote:
I'm sure i read somewhere that the altitude reading on sat nav systems is deliberatley inaccurate due to possible terrorist use.

i.e two signals in use.

a) US military scrambled is accurate.

b) General purpose signal for Say Nav systems with altitude set inaccuratley.

I can't remember where this came from though Confused


Hi There, Just to let you all know, the US error function has been switched off for a few years now. For a 3D lock and accurate height you will need a min of 4 sattelites tracked, dont know how many the LR D3 system tracks at any one time. Have you tried calibrating the system at a known point. Zermatt Silver
  
Post #11301924th Dec 2006 6:24 pm
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Barry C-All
 


Member Since: 13 Nov 2008
Location: Essex
Posts: 166

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

Hi, I am pretty convinced that my MY08 with the latest Sat Nav disc fitted, doen't show altitude. Sad
  
Post #4479701st Apr 2009 1:07 pm
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opodden
 


Member Since: 29 Jun 2006
Location: Elverum
Posts: 100

Norway 2005 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3
Geometry related altitude error

Due to the geometry between the receiver and the 4 satelites, the altitude will always be less accurate than your coordinates in latitude and longitude. It's a bit hard to explain, but as a gross approximation you could imagine that the receiver on the earth surface and the satelites are almost in the same plane, whereas the direction and distance to each satelite in that plane will vary much more. Thus the receiver will be able to calculate the 2D position more accurately than the altitude. Typically position will be accurate to within 3-7 meters, while altitude may be more than 3 times as much off.
  
Post #45614118th Apr 2009 1:04 pm
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Flack
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Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 4782

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3
Alitmeter

My altitude read out on my TT910 is very accurate even checked it with Google Earth. Thumbs Up

Flack Thumbs Up
 
IID Pro All D3 & D4 & RRS
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Post #45616218th Apr 2009 3:17 pm
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Roel
 


Member Since: 16 Aug 2008
Location: Down South in the desert
Posts: 1215

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

I have an old Garmin II plus in my Camel and that is accurate it reads about 2 meters high also on mountain peak when the reception is OK. It reads 2 m high as the external antenna is placed on the Camels roofrack.

So if an old Garmin can get good elevation measurements why not the LR system. That gives me 40m were about 0 or less should be the right number.
 Roel

1997 Camel Trophy Disco ex-P101JWK (traded it for a Britains 42101)
1984 90 TD5
2005 G4 Disco 3 BN55WPT

Also member of club MTR
and Club Faultmate

Interested in my 4x4 history see my website: www.mudmachine.webklik.nl
Sorry it's in Dutch and with google translator it gets funny. 
 
Post #45619518th Apr 2009 4:51 pm
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wvlenthe
 


Member Since: 07 Jan 2009
Location: Arnhem
Posts: 1962

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

Lelystad... definately less.

Rolling with laughter

Wiljo
 Two D3 V8 HSE Auto in Zermatt silver - one for the driveway, one for the living room cupboard.  
Post #45700520th Apr 2009 7:17 pm
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Roel
 


Member Since: 16 Aug 2008
Location: Down South in the desert
Posts: 1215

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

I know you are way above sea level but you should be more afraid because off the big rivers Rolling with laughter
 Roel

1997 Camel Trophy Disco ex-P101JWK (traded it for a Britains 42101)
1984 90 TD5
2005 G4 Disco 3 BN55WPT

Also member of club MTR
and Club Faultmate

Interested in my 4x4 history see my website: www.mudmachine.webklik.nl
Sorry it's in Dutch and with google translator it gets funny. 
 
Post #45720521st Apr 2009 10:03 am
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wvlenthe
 


Member Since: 07 Jan 2009
Location: Arnhem
Posts: 1962

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

Ehm. I've been looking.
Where's the altimeter readout on offroad nav? I only see latitude/longitude, no height.
Anyone have a piccie?

Wiljo
 Two D3 V8 HSE Auto in Zermatt silver - one for the driveway, one for the living room cupboard.  
Post #45737421st Apr 2009 6:42 pm
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wiggs
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Post #45737621st Apr 2009 6:55 pm
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wvlenthe
 


Member Since: 07 Jan 2009
Location: Arnhem
Posts: 1962

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

Wiggs,

who else would have the pic Laughing
Thanks a bunch Bow down

note to self:
must check if really that stupid not to notice numbers just next to other numbers.
Embarassed Banging Head

Wiljo
 Two D3 V8 HSE Auto in Zermatt silver - one for the driveway, one for the living room cupboard.  
Post #45737721st Apr 2009 6:58 pm
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JMC
 


Member Since: 25 Feb 2006
Location: Aberdeen-Angus. Where the Bull* comes from!
Posts: 6417

Scotland 

To be fair to you wvlenthe, when you're in the Netherlands you aren't going to notice many of those numbers for height in feet above sea level.... Laughing
 The older I get, the more I realise that people confuse wrinkles for wisdom Smile
Founder member of Club FFRRV
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Post #45743721st Apr 2009 8:15 pm
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wvlenthe
 


Member Since: 07 Jan 2009
Location: Arnhem
Posts: 1962

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Zermatt SilverDiscovery 3

Hi JMC,

Quote:
you aren't going to notice many of those numbers for height in feet above sea level

Correct, for more than one reason:
- we measure in meters not in ft Laughing
- not going to look at it much anyway
- and if I would, I could measure how high the local bridge or dike is relative to its surroundings Rolling with laughter

It seams to me displaying height *in a car* is quite pointless. I can imagine lots of uses where you want to know how high you are, but can anybody please tell me where else to find my car at a certain lat/lon position other than on ground level?

BUT
If it's on there, I want to (be able to) see it and know that it works (correctly). Boys and their toys... Well so far the D3 is telling me my driveway is 60m above sea level which is about 50 m overstated. So it does not work correctly and therewith I confirmed the fault in this topic.

regards,

Wiljo
 Two D3 V8 HSE Auto in Zermatt silver - one for the driveway, one for the living room cupboard.  
Post #45753622nd Apr 2009 6:18 am
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Roel
 


Member Since: 16 Aug 2008
Location: Down South in the desert
Posts: 1215

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

I am now on a Drilling Rig in Southern Germany. The wellsite elevation should be 715 m. The D3 is maybe standing 2 m Higher.

Click image to enlarge


The GPS antenna is mounted in the roof so ad another 2 m. The screen should read now 719 m.

It reads a little more:

Click image to enlarge


So here it reads about 41 m high.
At home it reads about 40 m. The garmin in my Camel with the antenna at the roofrack reads between -2 and 0. So it looks like that I have a contant difference of about 40 m High.

I will continue checking that.

Do you guys have a constant error?
 Roel

1997 Camel Trophy Disco ex-P101JWK (traded it for a Britains 42101)
1984 90 TD5
2005 G4 Disco 3 BN55WPT

Also member of club MTR
and Club Faultmate

Interested in my 4x4 history see my website: www.mudmachine.webklik.nl
Sorry it's in Dutch and with google translator it gets funny. 
 
Post #45755222nd Apr 2009 7:35 am
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JMC
 


Member Since: 25 Feb 2006
Location: Aberdeen-Angus. Where the Bull* comes from!
Posts: 6417

Scotland 

The overstatement of height in the D3 nav system is a built-in feature specifically to make purchasers in the Dutch market feel good about leaving their car parked at Schiphol Airport for any length of time. Laughing
 The older I get, the more I realise that people confuse wrinkles for wisdom Smile
Founder member of Club FFRRV
Club Orange, Mint or Fruit
Club Walnut Sniffers
 
 
Post #45759922nd Apr 2009 9:44 am
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stapldm
 


Member Since: 11 Sep 2006
Location: Swine Town
Posts: 2330

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

Could this constant height error be related to the reason the 'background' features in the road maps such as rivers and railway lines are always shown 100m North and 100m West of where they really are? You certainly can't rely on a "take the next left after the bridge" as the turn may well be before the river.
 Dr. Ian Malcolm:
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
Transgenic tomato anyone? 
 
Post #45761922nd Apr 2009 11:02 am
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