Re: Introduction and possible thread

[Jerry Kaidor <jerry@tr2.com>]

Curtis L. Olson wrote:

> I've played around a bit with the Jeppesen flight planning/moving map
> software.  I managed to spot one hideous bug.

*** Another problem with the Jeppesen data in general has to do with 
class D airports, or rather the class D airspace surrouding them.  I have
played with two products using the Jeppesen database, and they both
behave the same:

   Whereas class B and class C airspaces are shown with their actual shapes
and heights, class D are calculated algorithmically - that is, the software
assumes that they are always round, X miles in radius, and
up to 2500 feet AGL.  

   Real class D airspaces are not necessarily any of the above!  Especially 
in a complicated airspace like the SF Bay Area.  My Lowrance Airmap shows
that I am infringing on Palo Alto's airspace when I know damned well it
doesn't start till that tower over there!  And all the class D's around 
the Bay are truncated in height to clear the overlaying class B or class C.

   It's a pity, because a major potential use of a GPS is to help you thread
the needle getting in and out of a complex airspace like this.

                           - Jerry Kaidor ( jerry@tr2.com )
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