Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!npeer02.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail From: Lew 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) Organization: http://groups.google.com Lines: 37 Message-ID: <17275052.0.1331774645306.JavaMail.geo-discussion-forums@pbcsk1> References: NNTP-Posting-Host: 69.28.149.29 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: posting.google.com 1331774725 25084 127.0.0.1 (15 Mar 2012 01:25:25 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Thu, 15 Mar 2012 01:25:25 +0000 (UTC) In-Reply-To: Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=69.28.149.29; posting-account=CP-lKQoAAAAGtB5diOuGlDQk0jIwmH0T User-Agent: G2/1.0 X-Received-Bytes: 2605 Xref: csiph.com comp.lang.java.programmer:13013 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