Thread: OLC broken ?
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Old March 24th 07, 02:01 AM posted to rec.aviation.soaring
Greg Arnold
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Posts: 251
Default 2K7 OLC Tutorial for the masses?

Doug Haluza wrote:
On Mar 20, 5:53 am, "Doug Haluza" wrote:
You should always use the latest version of your software. As problems
are discovered, the vendors make updates, and there is no sense having
problems that are already solved. SeeYou is also testing a beta
version to deal with a strange data transmission issue with the new
OLC interface where "+" signs get corrupted in transmission, causing
validation to fail. This affects C302+ users, but could also randomly
affect anyone if there is a "+" sign in the digital signature.


SeeYou just released version 3.65 today, presumably with the fix for
the C302 OLC upload from the beta version. Be sure to download it if
you are a SeeYou user with current upgrade support. The web site shows
this as V3.62 on the download page, but will show v3.65 when you
install it.

Doug Haluza
SSA-OLC Admin




SeeYou still appears to be doing the OLC optimization different from the
OLC software. For purposes of the 1000 meter rule between the start and
end of the flight, OLC appears to take the height between the start and
end of the scored flight, while SeeYou appears to take it between
release from tow and the end of scored flight. Most of the time, this
doesn't matter.

However, it does matter under the right conditions. I had a flight
about a month ago (February 16) where the OLC score (direct upload) was
more than 20 points less than the SeeYou optimization. And today, the
OLC score (direct upload) was slightly higher than the SeeYou optimization.

Neither software appears to be consistent with the OLC rules:

The minimal finish altitude is 1000 metre below the start altitude.
The start altitude the lowest altitude after the begin of free flight
and before reaching the start point.
The start time is the time at which the start altitude is reached.
The finish altitude is the highest altitude after reaching the finish
point and before end of free flight.
The finish time is the time at which the finish altitude is reached
after the finish point is reached.

Where the OLC and SeeYou programs differ, I believe the "more correct"
score will be whichever is the higher. But it appears that both
softwares can give a score that is lower than what the OLC rules require
-- this will happen if the 1000 meter rule affects the result, and if
there is a point after release from tow and prior to start that is lower
than both tow release and start height (or if there is a point after
finish that is above the finish height).