Table 3.2: Sound Element description
Symbol
Description
Sound Level 6 (maximum sound level)
Sound Level 5
Sound Level 4
Sound Level 3
Sound Level 2
Sound Level 1
Sound is muted (No sound)
3.1.3
GPS
The
GPS
Element provides graphical indication about the current
GPS
signal quality. Basically,
the lower the PDOP value (position dilution of precision), the more accurate calculations are for
determining position . Values bellow 3,0 are fairly accurate. The relationship between what is
shown and the signal quality can be seen in Table
3.3
. Note that FAI rules require 3D tracklog
Table 3.3: GPS signal quality
Symbol
Description
3D position with a PDOP bellow 1.5
3D position with a PDOP between than 1.5 and 2.0
3D position with a PDOP between than 2.0 and 3.0
3D position with a PDOP greater than 3.0
2D position (no altitude information)
No GPS Signal
data, which includes
GPS altitude
. Therefore the NAV will only start recording a tracklog when
3D information is available.
The NAV has an high sensitivity 50 channel GPS receiver which
offers unmatched tracking performance in harsh signal environments (-160 dBm sensitivity), and
very short acquisition times. The NAV has a 4 Hz GPS update rate (most of others only provide
1Hz) which allows the NAV pilot to see very small speed and position changes. Furthermore, the
movement of the direction arrow is smoother and any position change is shown in a quarter of
the time of other devices. Note that the 4 Hz update rate requires more than 5 satellites in view.
More information about
GPS
accuracy and also other
GPS
related information can be seen in
(http://www.kowoma.de/en/gps/errors.htm).
3.1.4
Vario
The Analog Vario Elements shows information regarding the analogue instantaneous vertical speed.
There are four different Elements that can be used to display the vario. All of these element can be
resized and re-positioned.
Analog Vario
This Element which can be resized and repositioned, graphically represents the rate of climb, scaled
from 0 m/s to +/-10 m/s depending if you are climbing or sinking Figure
3.1
.
11
Содержание NAV
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