Digifly AIR-BT, Руководство пользователя

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6.10 GPS DIRECTION (TRK)
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The GPS direction (“TRK”) is the glider’s direction related to the ground.
6.11 GROUND EFFICIENCY (GLIDE RATIO)

It shows the efficiency (glide ratio) related to the ground.
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To set the time over which the average efficiency (glide ratio) is calculated, go to: ADVANCED
SETUP \ n. 8 EFF.
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If “Ground Speed” drops below 2km/h (1.2mph) or the GPS signal is not valid, the indicator shows: “-.--”.

ADVANCED SETUP \ n. 9 EFFA, to set the time to be used to calculate the average efficiency (glide ratio) to be
used for the glide calculation to WP (altitude upon arrival, etc.).

The average efficiency value is very important because it is the value used by the glide computer.
6.12 WIND SPEED AND DIRECTION INDICATION USING GPS

The wind speed and its direction are automatically calculated using the GPS info Tracking (“TRK”) and the
“Ground Speed (“Gs”).
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To determine the wind speed and its direction, you should make a “normal” turn, which has to be neither too
tight, nor too wide. It is also important to maintain constant airspeed during the turn.

For an accurate calculation at least a 360º turn must be completed.

This function uses the ADVANCED SETUP \ n. 22 WSEN parameter for the wind calculator sensibility (default 5).

Wind speed and direction are displayed in different ways on the instrument:
o
On the “Wind Speed” instrument displaying the direction in letters (N, E, SW, etc.); graphically with an arrow
and numeric figures (see figure above – left side).
o
On the “Plotter” instrument in two ways: a) Digitally, on the right side of the instrument, showing the
direction in letters and the strength in numbers and b) On the grid, it is displayed graphically with a flag
showing the direction it’s coming from (see figure above – center).
o
On the “Round Compass” instrument it is graphically displayed with a flag showing its direction and strength
in numbers, just below the flag (see figure above – right side).