Colin,
I believe that's not the way it works. The Earth works, roughly, as a
giant magnet whose ends correspond to the South and North poles. So your
compass does not invert when you go from one hemisphere to the other. The
needle always points along the magnetic field "lines", and these are
roughly parallel to the ground and to the meridians.
My guess is the reason for building special compasses for
Northern/Southern Hemisphere must have to do with compass behaviour at
high latitudes, where the field lines are no longer parallel to the
ground, and start "dipping" towards the ground when you fly towards the
pole. I suppose this requires clever mechanical compensations, which may
not be symmetrical.
Serge
"Colin Rainey" <brokerpi...@bellsouth.net>
Envoyé par : krnet-bounces+serge.vidal=sagem....@mylist.net
08/08/2006 14:40
Veuillez répondre à KRnet
Remis le : 08/08/2006 14:40
Pour : "KRnet" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : RE: KR> Drilling template for Precision Vertical Card Compass
Serge
It is my understanding that it will work fine as the magnetic attraction
will be to the South Pole, but the indications will be reversed: your
North
indication will be to the SOUTH POLE, so as long as you know that is what
you are seeing, then no confusion. All the quirks of the compass, ie: lead
and lag reverse in the Southern Hemisphere. You might get really good at
math conversions when given headings by approach control, cause you will
always be 180 degrees out.
-----Original Message-----
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Serge VIDAL
Sent: Tuesday, August 08, 2006 7:47 AM
To: kr...@mylist.net
Subject: KR> Drilling template for Precision Vertical Card Compass
I just made a printable paper template for the Precision Vertical Card
Compass. As usual with me, it's a Microsoft Powerpoint file. I'm not a
draughtsman by any account, so precision not garanteed. But it's free, so
anyone interested, just shoot.
(And by the way, could anyone tell me if that compass is going to work
well in the Southern Hemisphere, although it is a Northern Hemisphere
P/N?)
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
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