The track and altitude displayOnce the track has been saved to the output .igc file, then if more than one track fix point was found within the task window then FRDL displays a basic outline of the track, its altitude profile and some statistics.
If no track was found then the display will show that no track points were found in the task window. An igc file is still written so the analysis people know that the logger has actually been downloaded. It will contain all the appropriate information in it, except of course no track points.
The track display is probably good enough for both the organizer and the pilot to clearly understand what was recorded by the logger so it can be immediately returned to him.
It indicates poor reception which can be improved by the pilot placing the
logger in a better place in his aircraft next time.
It may also alert the organizer to important penalties such as outlandings which merit further detailed investigation.
Gaps in a track are shown whenever there is no data for a period of 30 seconds or more.
The displayed start and end times are the first and last log file entries which FRDL found within the task window. They are NOT takeoff or landing times.
Start position is shown as a green circular icon.
The max and min altitude are what FRDL found from amongst all log file entries within the task window, and may not indicate max and min altitudes flown since GPS receivers can easily generate false altitudes particularly whan they are starting up and when they have poor reception. Even with good reception, GPS altitude can easily show an error over true altitude of 500ft or more, so it should always be used in flight analysis as nothing more than a general indicator. For example, the altitude profile of a flight may clearly show an outlanding, but before being penalized this should always be further investigated by looking at such things as the distance between fixes or speed at the location of the supposed outlanding.