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Re: What are the proper terms for these concepts?

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From	Lew <lewbloch@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: What are the proper terms for these concepts?
Date	Wed, 14 Mar 2012 18:24:05 -0700 (PDT)
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Martin Gregorie wrote:
> Roedy Green wrote:
> 
>> Other places to look for terminology:
>> aircraft navigation,

Referenced by the links provided upthread.

> Here the 'bearing' is the direction from the aircraft to an external 
> point. The bearing is expressed in degrees where 0=N, 90=E, 180=S and 
> 270=W. If its undescribed or described as 'true', the reference line runs 
> through the geographic North Pole and if described as 'magnetic' the 
> reference line is through the magnetic North Pole.

Don't forget that that definition applies to absolute bearing. Relative bearing is taken from the craft's heading.

> 'Heading' describes where the aircraft is pointing using the same units, 
> description and reference, so a heading of 90 means the aircraft is 
> pointing east.
> 
> 'Track' or 'ground track' is similar to heading except that it refers to 
> the ground track of the aircraft and is not the same as the heading 
> unless the aircraft is flying parallel to the wind direction.
> 
> The wind direction is where the wind is coming from, so 45 is a north-
> easterly and runways are named the same way except that the direction is 
> divided by 10 and rounded with a leading zero added if the result has 
> less then 2 digits, so a runway on which you take off to the NE is 
> referred to as 05. 
>  
> > naval navigation,
> >
> AFAIK this is the same as aviation usage except that what aircrew call 
> the 'track' is known as the 'course'.

-- 
Lew

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What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-13 10:21 -0700
  Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-13 11:25 -0700
    Re: What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-13 13:35 -0700
      Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-13 13:57 -0700
        Re: What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-14 09:07 -0700
      Re: What are the proper terms for these concepts? "John B. Matthews" <nospam@nospam.invalid> - 2012-03-13 23:17 -0400
        Re: What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-14 09:02 -0700
  Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-13 11:29 -0700
  Re: What are the proper terms for these concepts? "Alex" <alex@foo.invalid> - 2012-03-13 21:49 +0000
  Re: What are the proper terms for these concepts? Roedy Green <see_website@mindprod.com.invalid> - 2012-03-14 15:30 -0700
    Re: What are the proper terms for these concepts? Martin Gregorie <martin@address-in-sig.invalid> - 2012-03-15 01:09 +0000
      Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-14 18:24 -0700
        Re: What are the proper terms for these concepts? Martin Gregorie <martin@address-in-sig.invalid> - 2012-03-15 22:05 +0000

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