GP941E 11/01
02.11.01
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3. Turning on the GP941:
After turning on supply power to the recorder there is an acoustic signal from the recorder to show
that it is operating:
2 x beep
= flight data recorder ready for recording
The red light (light emitting diode, LED) shows:
...
= no GPS reception
After about 2 minutes (glider away from buildings, GPS antenna unobstructed) the light emitting diode
changes to:
...
= GPS reception
Checking the GPS mode of the recorder can also be done by pressing the marker button:
press marker button; reply:
1 x beep
= no GPS reception
press marker button; reply:
2 x beep
= GPS reception
With a glider computer connected, the checking of GPS operation is done by watching the displayed
GPS information: if GPS information is present then the recorder is functioning properly.
As soon as the recorder is supplied with power, data recording starts. Every four seconds a point is
stored. Without GPS reception only time and barometric altitude are recorded, with GPS reception
position and GPS altitude are recorded too. A record ends by turning off the power and leaving it off
for more than 5 minutes or by establishing PC connection.
Short power cuts will not end a record.
Important:
The GP941 records always when power is applied; recording is active on the ground as well as in the
air, independent of speed or altitude.
During PC connection there is no recording.
Recording within the GP941 is done in that way that the last 50 hours of recording time are always
kept in the recorder. Flight data cannot be deleted, but the oldest flight data are overwritten by new
flight data.
Begin and end of any recording are stored in a separate list within the GP941. This list will keep the
last 200 records. With GPS reception, times for takeoff and landing are automatically inserted into
this list (first takeoff and last landing). This list can be read as flight log from the recorder to PC.
If the GP941 was not used for more than 4 month or the position has changed for more than 500km
compared to the last recording, it may take a longer time until GPS reception is available. After first
reception the GP941 should be kept running for more than one hour, so that the GPS receiver can
adapt to the new conditions.
This first recording should not be used for FAI or competition pur-
poses
.