Flytec 6030 * - Manual (Page 49)

Flytec 6030-GPS
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Experience has proven that about half of the otherwise unattractive landings have been
saved by pushing the steering bar upright when the stall alarm was triggered.
9.4 Navigation
9.4.1 Reception quality of GPS
The GPS-Receiver of the FLYTEC 6030 GPS is switched on / off by prolonged pressing on
the
F1 key. It can follow up to 16 satellites simultaneously. After turning on the unit it is
necessary to receive at least 4 satellites to fix position for the first time. Once logged on,
3 satellites (for 2D positioning) are sufficient for further navigation. However, if you want to
record altitude too (3D positioning), then definitely four satellites are required. There is a
table in the receiver, The Satellite Almanac, in which the path, place, and time of all
satellites are kept with reference to the receiver. The Almanac is continuously updated
during signal reception. However, if the signal to the Almanac memory is disrupted
completely or the unit is taken 200 km or more from the last reception point, then the
Almanac has to be re-established. Power is still supplied to the almanac’s memory even
when the unit is turned off.
Normally the instrument recognises its position under unobstructed view condition after
a few minutes. If the receiver is switched-off for a short time (less than 2 hrs.), the time for
new position finding is less than a minute. Buildings, mountains or thick forest affect
reception quality of the receiver. Therefore, you should always look for the best possible
visibility around you and the antenna in the casing should point upwards if possible.
In particular when mounted on the steering bar of the hang glider, we recommend not to
have the instrument fixed under the pilot’s head on the middle of the basis, but indeed
sideways. In this position the FLYTEC 6030 GPS should not have more than 45° deviation
from horizontal position so that the antenna points upwards.
Due to the fact that receiving strength of the satellite signals is only approx. 1/1000 of mobile
radios, these radio sets and other disruptive factors (like notebooks) should be operated as
far away as possible from the FLYTEC 6030 GPS. In addition to the signals of position
finding,
there is also the result of its precision which is transmitted. This is the DOP- signal
(Dilution of Precision). The value for reception excellence shown on the display screen is
derived from this value. If min. 50% of the symbols are filled up, the position error is less
than 10 m. The longer the bar, the better is the reception excellence. Besides, information
about the number of received satellites is shown on the right side of this bar for reception
quality.
The FLYTEC 6030 GPS is fitted with a 16-channel GPS-Receiver which is featured with
lesser power consumption and also a significantly shorter satellite detection time.
Precision is between 7 to 40m. As an average one may assume approx. 20 m.