IGC File Name Decoding Made Easy

At 16:42 07 September 2005, Martin Gregorie wrote:
On Wed, 07 Sep 2005 14:53:10 +0100, Tim Newport-Peace
wrote:

X-no-archive: yes
In article , Martin
Gregorie writes
.....
There's one unexplained item in the GNSS file specification:
some
loggers, e.g. the EW model D, have a serial number
of the form Dnnnn
which does not convert into the three alphanumeric
characters in any
obvious way. There's not a hint in the file specification
as to how this
feat might be performed.

The serial number is specified as three alphanumeric
characters in both
short and long form file names.

Dnnnn is not the serial number. The serial number
is held in the Firmware
and is used in the IGC filename (but not the *.EWT
filename.


(snip)

On some older recorders the serial number is expressed
to Base-10. This
has to be converted to Base-36 for use in IGC filenames.

79Y in base 36 is 9430 - so base 36 is certainly possible
if EW
number their model D loggers from 9000 in the firmware.

So, either exact implementation this part of the GNSS
spec would appear to
be optional or the EW model D is an older design than
I thought it was,
i.e. pre 1997. In that case, just how old are the EW
models A, B and C ???

--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |



EWA Serial numbers convert directly to base36
EWB add 2000 to the serial number and convert to base36
EWD add 9000 to the serial number and convert to base36

Cambridge, Garrecht (Volkslogger), Zander all use the
external serial.

Filser,LX,Colibri,PrintTechnik convert external serial
directly to base36

Please see my other post for the continuation of this thread. Please
don't add to this thread.

"FAI/IGC/CAI File Name Decoding - Automated"

I've got a head of steam up on getting this right.

Enjoy, John
email: johnatderosaweb.com