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magnetic deviation

Submitted: Tuesday, Apr 03, 2007 at 10:51

Peter from York 4x4

Hi can anyone tell me the current magnetic deviation for Western Australia please
York 4x4
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ThreadID: 43944 Replies: 6
Views: 886 FollowUps: 11
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AnswerID: 231404   Submitted: Tuesday, Apr 03, 2007 at 11:27

equinox replied:

Try this site here.
Red Rock
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Red Rock,
Great Victoria Desert
Reply 1 of 6
AnswerID: 231407   Submitted: Tuesday, Apr 03, 2007 at 11:34

Shaker replied:

I think you may have your teminology mixed up .......

Deviation is the error in reading a bearing from the compass caused by the magnetic influence of some nearby object.

Variation/Declination in Perth is approximately 1.5 degrees West, so True North is approximately 1.5 degrees east of your compass reading.
Reply 2 of 6
FollowupID: 492325   Submitted: Tuesday, Apr 03, 2007 at 11:43

Peter from York 4x4 posted:

thanks, I knew what I ment to say so i' m glad you knew what I ment, not what I asked to ment to say hahahaha
PS thanks for the answer it's what I was after
Peter
York 4x4
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FollowUp 1 of 2
FollowupID: 492377   Submitted: Tuesday, Apr 03, 2007 at 16:08

equinox posted:

In the website I listed above it shows Perth being 5.49 degrees. Meaning true north is 5.49 degress west of your compass reading.

So I disagree with Shaker by 6.99 degrees.

I will stand corrected of course.
Red Rock
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Red Rock,
Great Victoria Desert
FollowUp 2 of 2
AnswerID: 231418   Submitted: Tuesday, Apr 03, 2007 at 12:22

Member - Rotord replied:


Looking at my map of Port Hedland , variation is 1.9 degrees east , therefore , magnetic is least .
Reply 3 of 6
FollowupID: 492427   Submitted: Tuesday, Apr 03, 2007 at 19:39

macca172 posted:

East is least, west is best!
FollowUp 1 of 2
FollowupID: 492490   Submitted: Tuesday, Apr 03, 2007 at 22:19

djm67 posted:

Also remember to check what year that mag variation was correct for, and how much it moves, and in what direction, for each given year/period thereafter (e.g. the map should say something like 'reading is correct for 1995 and moves Easterly by 1 degree every 2 years')
FollowUp 2 of 2
AnswerID: 231424   Submitted: Tuesday, Apr 03, 2007 at 13:23

kingswoodwagon replied:

Peter,

the magnetic declination used 'in the field' is usually specific to that of the map or grid (in the case of surveying). assuming your trying to use the compass in conjunction with a particular map.

declination for that purpose is the difference between Magnetic North and Grid north.

all maps should state their declination (usually near north point or in title box)

a typical calm map in the south west of W.A. (DOLA -CALM would have a declination of 3-4 degrees. the NATMAP maps are closer to 2.5 degrees.

When converting a map bearing to a compass bearing, west is best (add declination), and east is least (subtract declination).

hope this helps
roopaw@westnet.com.au
Reply 4 of 6
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AnswerID: 231439   Submitted: Tuesday, Apr 03, 2007 at 14:53

Baldrick replied:

Varies according to where you are as well, not everywhere in WA will be the same.

The largest declination I have experienced (not in WA) is 87 deg!
Reply 5 of 6
FollowupID: 492370   Submitted: Tuesday, Apr 03, 2007 at 15:42

Member - Kiwi Kia posted:

Hi Baldrick, could you enlighten me as to where you were when you had 87 degree variation ? High lat. Canada maybe ?
FollowUp 1 of 4
FollowupID: 492577   Submitted: Wednesday, Apr 04, 2007 at 13:01

Baldrick posted:

Hi Kiwi Kia,

high latitude is right, but the other way - Davis, Antarctica. #8->
FollowUp 2 of 4
FollowupID: 492578   Submitted: Wednesday, Apr 04, 2007 at 13:08

Member - Kiwi Kia posted:

Ahh, Did you actually try using a compass down there? The needle would probably try and point straight down :-))
FollowUp 3 of 4
FollowupID: 492632   Submitted: Wednesday, Apr 04, 2007 at 18:27

Baldrick posted:

Actually we were far enough fom the magnetic pole that compasses still worked ok, it's just that the magnetic pole was nearly due east!
FollowUp 4 of 4
AnswerID: 231456   Submitted: Tuesday, Apr 03, 2007 at 16:43

Peter from York 4x4 replied:

Hi and thanks for all input , I have a new digital compass to be used in WA the instructions list the Eastern states as an average of 10.8 deg East , as I will only be using it in and around southern WA I was looking for an average declination to enter in the compass
Peter
York 4x4
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Reply 6 of 6
FollowupID: 492411   Submitted: Tuesday, Apr 03, 2007 at 18:17

Member - Andrew (QLD) posted:

An image to help visualise magnetic variation for Australia:



Andrew

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It may be that my sole purpose in life is to
serve as a warning to others!
FollowUp 1 of 3
FollowupID: 492593   Submitted: Wednesday, Apr 04, 2007 at 14:36

howie posted:

the map above gives a good idea of the variations.
if you want the exact variation at your position you can refer to a W.A.C. chart
from the aviation field.(world aero chart)
i only bother with variation when flying.
you would be hard pushed getting totally lost in SW w.a. by car!
FollowUp 2 of 3
FollowupID: 492599   Submitted: Wednesday, Apr 04, 2007 at 15:00

Peter from York 4x4 posted:

Thanks howie ,it's not for in the car I have oziexplorer for that this is for trailbike riding in larger state forrests etc
Peter
York 4x4
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FollowUp 3 of 3

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