Question for US Rules committee on AH capability within LX NAV computers?

This statement that you have written a "patch" disabling LK8000 competition
mode is quite untrue.
You are only enabling back the TRI.
On our website we clearly state:

THE ONLY APPROVED AND GRANTED TO BE COMPLIANT VERSIONS FOR COMPETITIONS ARE
DOWNLOADABLE FROM THE OFFICIAL RELEASE AUTHORITY OF THIS SOFTWARE, WHICH IS
lk8000.it .

DOWNLOADING THE SOFTWARE FROM ANY OTHER SOURCE DOES NOT - DOES NOT - GRANT
ANY KIND OF COMPLIANCY.

THE CRC/MD5 CHECKSUM FOR THE EXECUTABLES MUST MATCH THOSE OF THE EXECUTABLES
RELEASED BY THE SOFTWARE AUTHORITY.

This is also required by the US RC, and I believe it is a good approach.
In fact, your faked version will not pass the CRC MD5 check, and the user
will be banned as a cheater for the rest of his life.

So your statement
Given the existence of this patch, contest organizers cannot be sure
whether a pilot's PNA runs an approved LK8000 version or a fake
full-featured version with my patch.

is not true. You must do something more than that: fake the CRC MD5
checksum, and make the TRI it fit inside the same number of bytes of the
code.
And by the way, the compiler generating the code for LK8000 has been
recompiled for the purpose, so I doubt you can regenerate the same code.

Too optimistic, I guess.
paolo



"Max Kellermann" ha scritto nel messaggio
...
Paul Remde wrote:
This implies that the AHRS is completely disabled and can't be
re-enabled for the 14 days.

What if I publish a proof-of-concept patch that adds a horizon to
LX8000 and others, circumventing this switch?

I think I can assemble one for LX8000/9000 (from LXNav) and the
upcoming LX Zeus (from LX Navigation) in a matter of a few days. It
will not be detectable without special equipment. And it will work
without the new AHRS hardware.

(Pilots interested in such an exploit may send me a private message)

If mainline XCSoar gets banned, I will demonstrate that most other
products must be banned, too. Better keep an old first-generation
electronic vario at hand when you attend a contest, to avoid surprises
;-)

I have already written a patch for LK8000 that pretends to be
"LKCOMPETITION" but doesn't actually disable the horizon:

...