13.4.1
Turnpoint Complete
When this function has been set to YES, a brrrr sound is produced when the pilot has successfully
crossed a turnpoint (see
Turnpoint validation
)
13.4.2
Start Open
When this function has been set to YES, a siren type is produced when the start time has elapsed.
This tone does not indicate that a successful start has been made, however.
13.4.3
Goal Possible
When this function is set to YES, a brrr sound is made to indicate that it is possible to make GOAL.
This is based on having a positive number for altitude above goal. This is calculated based on the
average glide ratio and it takes into account wind, day quality and glider performance.
13.4.4
Airspace
When this function is set to YES, a siren type sound is produced indicating that the pilot has
entered the buffer zone (see Section
8
) close to airspace.
13.5
Advanced Features
The advanced features settings option can be used to set more of the NAV vario acoustics. (Figure
13.6
).
Figure 13.6: Advanced Features
13.5.1
Damper
The NAV ’s vertical speed calculation is based on air pressure variations. It is very seldom to have
air pressure absolutely stable. Turbulence caused by air moving near the sensor is sufficient to
cause small variations in pressure. For this reason the NAV filters (averages) the pressure data to
prevent constantly detecting tiny pressure variations. The value that defines how must the pressure
is filtered is the
Damper
. Setting a lower damper value caused the NAV to become more responsive
but harsher. Inversely a higher value causes the NAV to be less responsive but smoother. We have
found that an ideal value is 6 and therefore the default value.
13.5.2
Cadence
When a rate of climb is higher than that specified by the Climb threshold the NAV creates a beeping
sound. The rate (cadence) of the beeps increases as the climb rate increases. This increase in rate
is not linear. The cadence parameter specifies which cadence curve should be used. Current there
are 2 possibilities represented in the graph of Figure
13.7
.
48
Summary of Contents for NAV
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