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    Re: Ah, give someone a calculator.......
    From: Gary LaPook
    Date: 2010 Aug 14, 23:20 +0200

    DUH!
    
    0� to 179�.
    
    (Looks like I need a calculator.)
    
    gl
    
    
    Gary LaPook wrote:
    > I'm guessing that the "decent"units you are hinting at are meters. But 
    > then you run into problems with flight levels. To avoid midair 
    > collisions aircraft fly at different flight levels depending on the 
    > direction of flight.  Aircraft proceeding generally eastbound, on 
    > magnetic courses of 0� to 189�,  fly at odd thousands of feet and 
    > aircraft generally westbound, 180� to 359�, at even thousands of feet. 
    > (Talking about instrument flight rules here, visual flight rules are 
    > similar.) See Federal Flight Regulation 91.179 at:
    >
    > 
    http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=fcb7f258c93bc5abf78002493329d3a3&rgn=div8&view=text&node=14:2.0.1.3.10.2.6.45&idno=14 
    
    >
    >
    > International, ICAO, rules are the same.
    >
    > The thousand foot spacing prevents head on mid air collisions by 
    > compensating for inaccuracy in the altimeters and for less than 
    > perfect pilot technique in maintaining assigned altitudes.
    >
    >
    > But if we switched to meters then we would have to space flight levels 
    > 1000 meters apart which is too great since such large spacing is not 
    > necessary for safety and would eliminate 2/3 of all the current flight 
    > levels which would cause more planes to be operating on the few 
    > remaining flight levels making them more crowded and collisions more 
    > likely. And 100 meter spacing would not be great enough spacing given 
    > the above factors.
    >
    > So, I think we will just stick to using feet in aviation.
    >
    > gl
    > Marcel Tschudin wrote:
    >> That's the punishment for using originally some "strange" units. The
    >> problem wouldn't exist if all would use the same "decent" units ;-)
    >>
    >> BTW: I find this Web-page useful for obtaining statistical data from a
    >> location. The forecasts however don't seem to be very reliable.
    >>
    >> Marcel
    >>
    >>
    >>
    >>
    >>   
    >
    >
    >
    >
    >
    
    
    
    
    

       
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