Notes on SN10 Moving Map Airspace Data Preparation
(for Version 2.22, updated 26-May-2001)

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========================  Preparing Map Data  ======================

Airspace data must be pre-processed and then appended to the end of
an SN10 NDB file (see DBFORMAT.TXT for a complete description of the
NDB file format). Unlike the point data in the NDB file, the airspace
description data in an NDB file is not readable and consists of a
long list of lines that look like:
   A 15,48,181,245,27,50,124,0,1,1,49,50,45,66,0,0,0,0,0,0,

The airspace data is available in preprocessed form from ILEC for
various European countries. Prepare (or obtain a prepared) NDB file
as usual, and then append the pre-processed airspace data to the end
of the NDB file. After you have appended the airspace data, check
your NDB file using the DBC utility. After you have verified that the
NDB file format is OK, load the NDB file into your SN10 as usual.
Check your NDB file using DBC in a DOS window as follows:
   DBC mySite.NDB

Airspace description files in  Tim Newport-Peace's format can be 
translated for use in the SN10 using the provided AIRPAR32 utility. 
For free airspace data in TNP format (Tim Newport-Peace), visit the
world-wide turnpoint exchange's Special Use Airspace section at:
  http://acro.harvard.edu/SOARING/JL/SUA/HomePage.html
You can download a large airspace for a large area, and edit this
down to the portions you need for your site.
For a complete description of the TNP format, please see:
  http://www.spsys.demon.co.uk/software/airspace.zip

AIRPAR32.EXE is a 32-bit Windows console application with two
required arguments:
  - the COMLPETE file name (bayreuth.air, minden.sua, etc.)
  - coordinates of the home point **IN QUOTES**. These coordinates
    should match or be very close to the home point in your NDB
    file.
For example:
  airPar32 bayreuth.air "49:59.067 N 011:38.317 E"
AIRPAR32 will write the processed airspace data into a file
named AIRSPACE.TXT, which you should append to your NDB file.

If you wish to use a file containing airspace information for a very
large area (for example, the entire US), AIRPAR32.EXE can also ignore
airspace outside a square centered at the home point. The box is
specified by the distance in km from the home point to the edge
of the square. For example:
   airpar32 conUS.sua "42:25.500 N  71:47.470 W" -C 150
will output only those airspace figures partially or wholly within
the square centered at "42:25.500 N  71:47.470 W" and 150km to
the edge (the square is 300km across).

Note: Airspace data processing has been implemented as a separate
step from NDB file processing because:
- We'll support additional airspace file formats in the future, and
- To continue to support DOS PC users (HL) we had to keep HL small !
- AIRPAR32 returns 0 on success, -1 if an error occurred


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Please let me know what you think; your feedback is appreciated !

Thanks in advance for your comments, Fly Safe, and Have Fun,
Best Regards, Dave Nadler

Dave Nadler "YO"
USA East Coast (978) 263-0097
drn@nadler.com