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  • Gianluca
    Gianluca posted a Visitor Message for Tony Pike
    Hi Tony, what in your opinion is the best way to learn Polar Stereographic Charts? I'm still not comfortable with them and could use some extra help.
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  • I'll ask the ref David (Icke) this afternoon, during our annual New Year's Day footie match against the 'greys'. Wow, I've never been called an 'overlord' before! Something of a triumph (or should that read 'something of a trump'........swings cape across face and disappears into the shadows..........
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  • Whilst I would have thought that it would have been no more accurate than Inertial Systems, I did read some time back that the US intended to introduce LORAN E, as a back-up for long range navigation in the event of the Sun throwing its toys out of the pram and frying the NAVSTAR, etc. SVs with a great...
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  • Tony Pike
    replied to Convergence/convergency
    No, not really. It's just terminology.

    Convergency can be defined as the change in bearing between two points along a track line, measured in degrees true, or in other words the change of longitude at the North Pole.

    That only really applies to a 2D surface. It is complicated...
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  • By 'open' questions I take it you mean questions which are not multiple choice but which require an answer to be typed in.

    Firstly, this was not due to be brought into force until the summer of 2017, in the UK at least.

    Secondly, given the evidence of the past ten years I am...
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  • Why has the CAA changed it to 90 questions?

    Current EASA regulations show the Meteorology examination as being 84 questions and Notice of Proposed Amendment 2016-03(A) maintains it as 84 questions.

    https://www.easa.europa.eu/system/fi...2016-03(A).pdf (page 5...
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  • No, LO 062-04 - Hyperbolic Navigation Systems - was condemned to the radio navigation graveyard in April 2012. You should not be seeing these questions.

    Sounds like a 'flag' problem in the qb database.
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  • Tony Pike
    replied to 4% Temperature Corrections
    First of all, the learning objectives are contradictory....Met states 27' per 1 hPa, Gen Nav states 30' per 1 hPa, Instruments states nothing! I use 30' as it's an easier number to work with and the difference is negligible.

    So, I will do the problems above using 30'.

    Option...
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  • Tony Pike
    replied to 4% Temperature Corrections
    Thank you HP,

    Not sure who actually does the calculation? Could be said blokey in tower..or maybe data fed to regional met station and a computer figures it out.

    Is there an error in QNH? Yes, if the conditions between the QFE pressure datum and mean sea level are anything...
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  • Tony Pike
    replied to 4% Temperature Corrections
    The barometric altimeter is calibrated for ISA and indicates altitude at a rate of 30' (for sake of argument) for every 1 hPa in detected pressure change.

    Therefore, after detecting a 10 hPa pressure reduction it will indicate an increase in altitude of 300'.

    Elevation of an...
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  • To be honest, from a mathematical perspective it doesn't really matter which way they are applied - you can even take the sum of all variation, deviation and drift and apply it to one end to calculate the other end.....but not advisable, I've been teaching this for years and still ck it up!
    ...
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  • I cannot answer on behalf of BGS but from the information I have received and from John's post above I would safely assume that UK BGS students will not see PBN questions in any UK CAA exam.

    It appears that certain overseas clients of BGS have had to satisfy their respective national aviation...
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    Last edited by Tony Pike; 24-12-2016, 14:42.

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  • Tony Pike
    replied to Mercator scale quiries.
    My pleasure.

    Think about it. Meridians on a DM chart are straight, parallel, equidistant lines whereas meridians on the earth are converging lines, with the distance between them reducing with increasing latitude.

    Therefore, scale MUST be changing with latitude.

    ...
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  • Tony Pike
    replied to Mercator scale quiries.
    Scale is the ratio of Chart Distance to Earth Distance. The question asks for the chart distance and you need to calculate the earth distance using, as you correctly point out, the departure formula.

    Departure = Change of Longitude (minutes) x Cosine of the latitude
    Departure = (W008...
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  • Tony Pike
    replied to Mercator scale queries
    The software truncates everything after degree symbols (or any other special symbols) so you need to type it out in full!...
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  • This is a brand new topic known as RNAV Performance Based Navigation (PBN), which is now in common use throughout commercial air transportation. These are RNAV path and terminator descriptors.

    ARINC 424 is the standard in aviation for data preparation and transmission in airborne navigation...
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    Last edited by Tony Pike; 22-12-2016, 15:24.

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  • The MNEMONIC ;-) C D M V T is used to recall the order for conversion between Compass (via Deviation) to Magnetic (via Variation) to True Headings (or Tracks/Courses, dependent on the context of the question). Whether true track and true heading are equal or not will depend on the wind direction and...
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  • Tony Pike
    replied to FPL Help
    I am not from BGS but can say that all exams are randomly created at the time of sitting and it is therefore statistically possible that a significant sample of examinees may not see any questions of a particular type during one or two sittings.

    This does not mean that they are no longer...
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  • Referring to the following question posted above, and recognising that it is not easy to recall exam questions accurately:

    Departure Airport Elevation 2500 feet
    TOC FL105
    ROC 1500/MIN
    QNH 995
    How long does it take to reach TOC?
    1. 12
    2. 11
    3. 10
    4. 9
    Climbing to FL105...
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  • You have really opened Pandora's Box here. :-)

    But, in a nutshell you are right.

    There are in fact two magnetic north poles and two magnetic south poles (by name)

    There are the Magnetic Dip Poles and the Geomagnetic Poles, each one having a north and south pole....
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Tony Pike
Tony Pike
Last Activity: Yesterday, 14:48
Joined: 25-06-2006
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