Re: Subscription to NASD CD-ROM (was: embedded ...)

[dab@froghouse.org]

On 11 Feb, Bob_Deep wrote:

> I thought that the Jeppeson approach plates, though different looking
> than the NOS ones, where functionally equivalent.

I think the key thing to remember is there are three sources of
information, Jeppesen, FAA, and NOS.  Jeppesen and NOS produce
approach plates; Jeppesen and the FAA produce digital data.  It's
quite a leap of faith to assume that NOS plates are produced from FAA
digital data without correction.

A question I have for people who've looked at the FAA data, is there
even enough information in there to produce a complete set of approach
plates?  Or even one approach plate?  I expect that terrain and
obstruction information is missing but what about all the rest of the
stuff?  I believe both Jepp and NOS plates are hand drawn.  I suspect
that Jepp is moving towards an automated system from data but I don't
think they're there yet (reference the JeppView CDROM being full of
scanned in approach plates).  I have no idea what NOS is up to.

 -Dave


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