[Navigation] Variation & Deviation
Thread Starter
Joined: May 2009
Posts: 25
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From: England
[Navigation] Variation & Deviation
Hello!
I am currently studying for my PPL(a) in the United Kingdom. I have recently bought the "Air Pilot's Manual" series and have been trying to answer the helpful questions at the back of the book.
For the Air Navigation book (book 3), there is one particular question on variation & deviation which has slightly confused me. Here is the question:
Given the following deviation card, fill in the blank spaces in Table 3 below (page 449 for anybody with a copy of this book):
I filled out the table and it looks like this:
I am currently studying for my PPL(a) in the United Kingdom. I have recently bought the "Air Pilot's Manual" series and have been trying to answer the helpful questions at the back of the book.
For the Air Navigation book (book 3), there is one particular question on variation & deviation which has slightly confused me. Here is the question:
Given the following deviation card, fill in the blank spaces in Table 3 below (page 449 for anybody with a copy of this book):
FOR/STEER:
N/003
E/087
S/181
W/272
N/003
E/087
S/181
W/272
I filled out the table and it looks like this:
All of my answers were correct apart from the one highlighted in red. According to the book, the answer is actually 022.
My question is... why?
Thank-you.
My question is... why?
Thank-you.
Joined: Mar 2005
Posts: 36
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From: Home
Rather than just give you the answer, I'll give you another question!
Give Compass headings for the following True headings, all Var 8W, and Dev as per your original question;
T
090
060
045
030
360
Hope that helps!
KR
AS
Give Compass headings for the following True headings, all Var 8W, and Dev as per your original question;
T
090
060
045
030
360
Hope that helps!
KR
AS
Joined: Nov 2006
Posts: 6
Likes: 0
From: London
Variation / Deviation
From the Deviation card, track N, steer 003 (3 right) and at E steer 087 (3 left), so there is a difference of 6 degrees right to left. Interpolate and do the maths.
More importantly, for as much as you plan, when in the air, the wind will seldom be as planned, so corrections are necessary. So while good planning is very important, good technique for corrections is paramount.
Good luck with the exam and hope that helps.
More importantly, for as much as you plan, when in the air, the wind will seldom be as planned, so corrections are necessary. So while good planning is very important, good technique for corrections is paramount.
Good luck with the exam and hope that helps.
Joined: Jun 2009
Posts: 18
Likes: 0
From: Land of free
From the Deviation card, track N, steer 003 (3 right) and at E steer 087 (3 left), so there is a difference of 6 degrees right to left. Interpolate and do the maths.
Could you explain the maths behind it bit further?
Thanks!
Joined: Apr 2004
Posts: 734
Likes: 10
From: London, GB
Quickest approach for this is linear interpolation.
Here's a graph depicting the above problem to complement the Wiki article. In this example the 021.67° has been rounded to 022° as most of us, in Britain at least, try to avoid flying decimal degrees.
Here's a graph depicting the above problem to complement the Wiki article. In this example the 021.67° has been rounded to 022° as most of us, in Britain at least, try to avoid flying decimal degrees.
