A few pilots have been caught out lately having not upgraded or
used the WGS84 Ellipsoid setting on their flight instruments. First Kevin Dutt
didn't get the first clock despite his Flytec 6030 giving him the happy sound.

The start time was 2:20 PM. The last time he was in the start cylinder according
to the WGS84 ellipsoid as illustrated here on SeeYou set to the ellipsoid, was
at 2:19:30 PM.

He performed two circles outside the start cylinder and the closest he got back
to the start cylinder was at 2:20:20 PM and he was about 45 meters outside the
cylinder at that point. Using FS2018 for scoring, and Flymaster trackers for the
track logs, and 0.1% error band, he would have had to have been within 5 meters
of the edge of the start cylinder.

A review of the difference between the FAI sphere and the WGS84 ellipsoid
indicates that it is necessary to set your start radius cylinder for a 5 KM
cylinder if your instrument is set for the FAI sphere, to 4.97 km or 30 meters
inside the 5 km cylinder.

I came very close to also blowing it that day. I had forgotten to change my
setting on my Flytec 6030 to WGS84 Ellipsoid, even though unlike Kevin, I had
upgraded the 6030. This is my track log:

I was 10 meters outside the start cylinder at 1 second after the start time,
which just put me inside the start cylinder at 16 kilometers per second (35 mph)
at the start time. A pretty close shave. Pure luck, of course.

On Tuesday, Matjaz Klemencic, got caught when he didn't go far enough into a
large cylinder at the Spring meet.

https://airtribune.com/springmeeting-2019/results

https://airtribune.com/springmeeting-2019/results/task4032/day/class-1

The cylinder was 11 KM. The error band would be 11 meters.

The Flymaster web site shows him making the turnpoint and getting to goal in 5th
spot. The Flymaster web site apparently has a different error band than the 0.1%
that they were using at the competition.