Leg departure and arrival times are reported by timers at each stop, and calculated from GPS data collected by the Bad Elf loggers that teams carry during the race. In the ARC reports, GPS times are reported to millisecond accuracy. Times from the ground timers are shown to the nearest second, with milliseconds replaced by dashes to distinguish them from GPS times.
In the 2018 team and leg reports, for example Leg 2
, most departure and arrival times are shown as links (times reported by ground timers, and some GPS times with incomplete data, do not include links). Clicking one of these links will download a GPX file for that flyby.
Each GPX file includes trackpoints extracted from the team's original Bad Elf files, recorded every second, from two minutes before to two minutes after the team crosses the timing line. These small files isolate the flybys, identify the location, indicate arrival or departure, show where the flybys cross the timing lines, and show the one-mile-out points (one mile out from the timing line or, starting in 2019, from the end of the runway).
The GPX files can be opened by dragging them to a Google Earth window. Individual trackpoints include the Zulu date and time that the trackpoint was recorded. If two flybys are close in time, for example in the case of dual flybys, it is interesting to plot both flybys and use the Google Earth time slider to compare the flights. To find such cases, open a leg report sorted by arrival or departure time and look for close times. There are often duals at the end of the first
leg, for example ARC 48
and ARC 50
arriving at Alva.
A sample image from Google Earth is shown here. Please contact the ARC
if you have questions.
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