Mark,
That sort of stuff has been available for a long time, just cheaper
and even more ubiquitous now.
About 12 years ago a guy claimed on r.a.s. that he had done this. He
knew some guys in military electronics in the US. He thought the IGC
security requirements were ludicrous because of this gaping hole in
the security.
You probably don't need to buy one, just know somebody who works at a
small company that has one and that he can take home on the weekend.
This was all discussed extensively when the IGC decided to adopt GNSS
loggers and they even made a rule "It is prohibited to feed data into
the device via the antenna".
Makes all the rest of the security song and dance look pretty silly.
As ever, security comes down to people - in this case the O.O.s. If
the O.O. is present at the beginning and end of flight and scutineers
the glider you'll get reasonable security. The IGC decided they
couldn't trust the O.O. so tried to build the security into the
hardware. Epic fail.
If you own an IGC flight recorder just think of all the money you
were forced to spend for non existent security.
Come to think of it, a device like this would be great for AATs. Fly
the task and record the GPS position and move it a little further
each fix until you've flown a greater distance. Feed that through the
device and into the FR in near real time.
Mike
At 12:29 PM 20/01/2011, you wrote:
Amazing the kind of stuff that's available off-the-shelf these days.
I reckon if you put one of these and a IGC-approved logger into a
barometric chamber, you can create the world record datalogger trace
of your choice:
http://labsat.co.uk/
The labsat unit takes a GPS or GNSS datafile and plays it back as RF,
so a nearby GPS device will actually believe that it has followed the
course described by the trace. With a barometric chamber you get the
pressure altitude axis as well. The result will be a datafile you
can extract from your IGC-approved logger which says pretty much
whatever you want it to say.
It costs about UKP7000, so you might want to buy into one in a
syndicate with other like-minded cheats. "Tell you what, I'll
claim the distance record, why don't you claim the speed-around-
a-300km-triangle record?"
Meanwhile, there're also ways of preventing other people from getting
logger traces. For about twenty bucks you can get one of these:
http://www.dealextreme.com/details.dx/sku.35827
Couple it with a 12V power source and hide it in the tiedown kit bag
in whichever aircraft is at the top of a competition leaderboard to
produce a "I would have won that comp if it weren't for that goddamn
GPS malfunction!" result. Maybe you're not even competing in the
comp, you just want to stir trouble 'cos you're taking the piss.
It comes with free delivery :-)
The equipment required to both forge and sabotage GPS traces is
readily available off-the-shelf at prices that individuals can afford.
For how long will GPS continue to be trusted for world record and
competition claims? Will we get back to using barographs and cameras?
Are the requirements on official observers good enough to protect against
forgery?
I love the 21st century :-)
- mark
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