GPS update rate (most of others only provide 1Hz) which allows the GPS SD+ 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://en.wikipedia.org/wiki/Error_analysis_for_the_Global_Positioning_System
).
3.1.5 Vario
The Analog Vario Elements shows information regarding the analogue instantaneous vertical speed. There
are four dierent 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
.
Figure 3.1: Analog Vario
When the GPS SD+ detects that the pilot is climbing, a black bar starts to grow on the left, from the
bottom of the scale to the top ,with 0.1 m/s increments. The same bar grows on the right, from the top
of the scale to the bottom, if sinking is detected.
Big Analog Vario
The Big Analog Vario element shows the instantaneous vertical speed (Figure
3.2
). This element can be
resized and re-positioned.
Figure 3.2: Big Analog Vario
This Element graphically represents the rate of climb, scaled from 0 m/s to +/-10 m/s depending if you
are climbing or sinking. In this Element a black bar starts from the middle of the scale and grows at 0.1
m/s increments, up to 5 m/s at the top of the scale. When 5 m/s value is reached the black bar starts to
disappear from 0 m/s (middle of the scale) until the top of the scale. When the bar completely disappears
the climbing rate is equal, or above 10 m/s. The same process occurs when descending, but from the
middle of the scale to the bottom.
10
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