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  1. #1
    Tom Stian Bjerk
    Guest

    CDU and Alternate Destination

    In the menu INDEX->ALTN the CDU shows the nearest alternate airports. But
    the distanse the CDU is calculating is very wrong, if I understand the
    function right. Its shows that the closest airport is about 138nm away, but

    it is 55nm away.

    What is correct?

    _Best Regards
    Tom Stian Bjerk


  2. #2
    Enrico Schiratti
    Guest

    Re: CDU and Alternate Destination

    > In the menu INDEX->ALTN the CDU shows the nearest alternate airports. But
    > the distanse the CDU is calculating is very wrong, if I understand the
    > function right. Its shows that the closest airport is about 138nm away,
    > but
    >
    > it is 55nm away.
    >
    > What is correct?


    Can you let me check that example? What position are you at, which airports

    are listed and how do you measure the distance?

    I did a quick check and it looks right to me.


  3. #3
    Tom Stian Bjerk
    Guest

    Re: CDU and Alternate Destination

    I am flying south of ENCN (Norway) at FL370. I measure the distance with
    FSNavigator and with the VOR at the airport.. using the 0603 navdata.

    Best Regards
    Tom Stian Bjerk

    "Enrico Schiratti" wrote in message
    news:409607.81201@wb.onvix.com...
    >> In the menu INDEX->ALTN the CDU shows the nearest alternate airports.

    But
    >> the distanse the CDU is calculating is very wrong, if I understand the
    >> function right. Its shows that the closest airport is about 138nm away,
    >> but
    >>
    >> it is 55nm away.
    >>
    >> What is correct?

    >
    > Can you let me check that example? What position are you at, which
    > airports
    >
    > are listed and how do you measure the distance?
    >
    > I did a quick check and it looks right to me.
    >



  4. #4
    Enrico Schiratti
    Guest

    Re: CDU and Alternate Destination

    >I am flying south of ENCN (Norway) at FL370. I measure the distance with
    > FSNavigator and with the VOR at the airport.. using the 0603 navdata.


    Ok, I checked.

    Then it is really quite simple... how do you want the aircraft to descent
    from FL370 down to the airport you are currently overflying?

    There is a calculation inside that list which keeps in mind what altitude
    you are at, and calculates the distance over ground it takes to get there. I

    put it in a long time ago, and I won't remove it just like that unless I
    find out it is completely wrong.

    Ciao

    Enrico


    > "Enrico Schiratti" wrote in message
    > news:409607.81201@wb.onvix.com...
    >>> In the menu INDEX->ALTN the CDU shows the nearest alternate airports.

    > But
    >>> the distanse the CDU is calculating is very wrong, if I understand the
    >>> function right. Its shows that the closest airport is about 138nm away,
    >>> but
    >>>
    >>> it is 55nm away.
    >>>
    >>> What is correct?

    >>
    >> Can you let me check that example? What position are you at, which
    >> airports
    >>
    >> are listed and how do you measure the distance?
    >>
    >> I did a quick check and it looks right to me.
    >>

    >



  5. #5
    Enrico Schiratti
    Guest

    Re: CDU and Alternate Destination

    Just to underline it... there is a time listed just next to the distance...

    and that can't be the current time if you are at FL370 and 3 miles from the

    airport.

    Ciao

    Enrico

    "Enrico Schiratti" wrote in message
    news:409854.81201@wb.onvix.com...
    > >I am flying south of ENCN (Norway) at FL370. I measure the distance with
    >> FSNavigator and with the VOR at the airport.. using the 0603 navdata.

    >
    > Ok, I checked.
    >
    > Then it is really quite simple... how do you want the aircraft to descent
    > from FL370 down to the airport you are currently overflying?
    >
    > There is a calculation inside that list which keeps in mind what altitude
    > you are at, and calculates the distance over ground it takes to get there.


    > I
    >
    > put it in a long time ago, and I won't remove it just like that unless I
    > find out it is completely wrong.
    >
    > Ciao
    >
    > Enrico
    >
    >
    >> "Enrico Schiratti" wrote in message
    >> news:409607.81201@wb.onvix.com...
    >>>> In the menu INDEX->ALTN the CDU shows the nearest alternate airports.

    >> But
    >>>> the distanse the CDU is calculating is very wrong, if I understand the
    >>>> function right. Its shows that the closest airport is about 138nm

    away,
    >>>> but
    >>>>
    >>>> it is 55nm away.
    >>>>
    >>>> What is correct?
    >>>
    >>> Can you let me check that example? What position are you at, which
    >>> airports
    >>>
    >>> are listed and how do you measure the distance?
    >>>
    >>> I did a quick check and it looks right to me.
    >>>

    >>

    >



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