On 25 Jan 2004 21:10:49 GMT, (SSpiers) wrote:

Come on now chaps we all look to the net for our info.
I have been trying to find the exact altitude for my weather station but the OS
maps dont make it clear to me.
So i brought an old aircraft altimeter and set it too read QFE(Hight above sea
level)at Gatwick airport.This is my datum and is 202ft AMSL, and when i arrive
home it tells me a height of approx 415 Ft.
Heavens above seemed to think i was at 475 Ft!I am the highest part of Crawley
Down.
Hi,
Gatwick appears to be not very far away from Crawley Down. Gatwick is
196ft or 60mtrs above sea level. So if you could pinpoint your
position on the OS map and let me have the NGR we can work out how
much your barometer needs to be adjusted by using Gatwick's QNH.

Norman

On Mon, 26 Jan 2004 01:03:06 +0000 (UTC), .
(Norman) wrote:

On 25 Jan 2004 21:10:49 GMT, (SSpiers) wrote:

Come on now chaps we all look to the net for our info.
I have been trying to find the exact altitude for my weather station but the OS
maps dont make it clear to me.
So i brought an old aircraft altimeter and set it too read QFE(Hight above sea
level)at Gatwick airport.This is my datum and is 202ft AMSL, and when i arrive
home it tells me a height of approx 415 Ft.
Heavens above seemed to think i was at 475 Ft!I am the highest part of Crawley
Down.
Hi,
QFE is height above airfield elevation. You need to set your barometer
to QNH (height above sea level)
If you look on a 1:25000 map of your area and find the nearest spot
height marked on the map which will be in metres. Convert this to
feet.
Find the nearest airport and request the current QNH reading which
will be in millibars. Deduct 1 millibar from the QNH reading for every
This should be ADD 1 millibar for every 10mtres or every 30ft. Sorry
about that.
30ft above the QNH (or 1 millibar for every 10 metres) and set your
barometer by turning the adjusting screw at the back to set the dial
to the adjusted figure.
If you look on this page you can get airfield QNH readings:
http://www.xcweather.co.uk/

Norman

The easiest way is to go to the BBC weather page and input your
postcode to find the local weather station readings then set your
barometer to that.

Norman

On Mon, 26 Jan 2004 01:15:44 +0000 (UTC), .
(Norman) wrote:

On 25 Jan 2004 21:10:49 GMT, (SSpiers) wrote:

Come on now chaps we all look to the net for our info.
I have been trying to find the exact altitude for my weather station but the OS
maps dont make it clear to me.
So i brought an old aircraft altimeter and set it too read QFE(Hight above sea
level)at Gatwick airport.This is my datum and is 202ft AMSL, and when i arrive
home it tells me a height of approx 415 Ft.
Heavens above seemed to think i was at 475 Ft!I am the highest part of Crawley
Down.
Hi,
Gatwick appears to be not very far away from Crawley Down. Gatwick is
196ft or 60mtrs above sea level. So if you could pinpoint your
position on the OS map and let me have the NGR we can work out how
much your barometer needs to be adjusted by using Gatwick's QNH.

The highest part of Crawley Down (within the main built up area) is
427 feet amsl. OS grid ref: TQ 34700, 37850. Hope this helps.

--
Dave

On Mon, 26 Jan 2004 02:55:18 +0000, Dave Ludlow
wrote:

On Mon, 26 Jan 2004 01:15:44 +0000 (UTC), .
(Norman) wrote:

On 25 Jan 2004 21:10:49 GMT, (SSpiers) wrote:

Come on now chaps we all look to the net for our info.
I have been trying to find the exact altitude for my weather station but the OS
maps dont make it clear to me.
So i brought an old aircraft altimeter and set it too read QFE(Hight above sea
level)at Gatwick airport.This is my datum and is 202ft AMSL, and when i arrive
home it tells me a height of approx 415 Ft.
Heavens above seemed to think i was at 475 Ft!I am the highest part of Crawley
Down.
Hi,
Gatwick appears to be not very far away from Crawley Down. Gatwick is
196ft or 60mtrs above sea level. So if you could pinpoint your
position on the OS map and let me have the NGR we can work out how
much your barometer needs to be adjusted by using Gatwick's QNH.

The highest part of Crawley Down (within the main built up area) is
427 feet amsl. OS grid ref: TQ 34700, 37850. Hope this helps.
Hi Dave,

Using Gatwick as the reference you should alter your barometer to
8 millibars higher. At 0820hrs Gatwick was 1002mb so yours should read
1010mb. (427ft -196ft /30 =7.7
Norman

On Mon, 26 Jan 2004 09:02:31 +0000 (UTC), .
(Norman) wrote:

On Mon, 26 Jan 2004 02:55:18 +0000, Dave Ludlow
wrote:

On Mon, 26 Jan 2004 01:15:44 +0000 (UTC), .
(Norman) wrote:

On 25 Jan 2004 21:10:49 GMT, (SSpiers) wrote:

Come on now chaps we all look to the net for our info.
I have been trying to find the exact altitude for my weather station but the OS
maps dont make it clear to me.
So i brought an old aircraft altimeter and set it too read QFE(Hight above sea
level)at Gatwick airport.This is my datum and is 202ft AMSL, and when i arrive
home it tells me a height of approx 415 Ft.
Heavens above seemed to think i was at 475 Ft!I am the highest part of Crawley
Down.
Hi,
Gatwick appears to be not very far away from Crawley Down. Gatwick is
196ft or 60mtrs above sea level. So if you could pinpoint your
position on the OS map and let me have the NGR we can work out how
much your barometer needs to be adjusted by using Gatwick's QNH.

The highest part of Crawley Down (within the main built up area) is
427 feet amsl. OS grid ref: TQ 34700, 37850. Hope this helps.
Hi Dave,

Using Gatwick as the reference you should alter your barometer to
8 millibars higher. At 0820hrs Gatwick was 1002mb so yours should read
1010mb. (427ft -196ft /30 =7.7
Norman
Probably best to set it to the same as Gatwick

"Chris Malcolm" wrote in message
...
"Col" writes:

Yes, how sad it is that somebody should want to find an online
source for determining their height abve sea level.

I think you miss the point. It's general: it will not only find *your*
height above sea level, but the height above sea level of anywhere in
the UK, specified either by post code, OS Grid Ref, or simply clicking
a pointer on the map. The map displayed is exactly the same as the OS
map you would find in a shop or library, except that the entire
country is available, at no extra charge beyond what your on-line
access costs (for many of us the marginal extra cost is zero).

I think *you* miss the point.
I was in fact being sarcastic

Col
--
Bolton, Lancashire.
160m asl.
http://www.reddwarfer.btinternet.co.uk

Yes i stand corrected!
QFE is hight above airfield elevation,QNH is above sea level.
Sorry for any confusion caused.
Simon

"SSpiers" wrote in message
...
Yes i stand corrected!
QFE is hight above airfield elevation,QNH is above sea level.

most of these definitions can be found by following the links in the FAQ
index (see my sig file), or direct at:-

http://homepage.ntlworld.com/booty.w....htm#Qsettings


--
FAQ & Glossary for uk.sci.weather at:-
http://homepage.ntlworld.com/booty.weather/uswfaqfr.htm