Flymaster NAV, User Manual

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Figure 13.7: Cadence timing
13.5.3 Dynamic Frequency
The NAV beeps at a specified pitch (frequency) when a certain rate of climb is encountered. When
dynamic frequency is off, the pitch (frequency) of that beep will remain constant if the rate of climb
changes. With dynamic frequency on, the pitch of the beep may vary if the rate of climb varies
during the individual beep.
13.5.4 Buzzer
Is so called because of the sound it emits, which resembles a buzzing sound.
The buzzer sound is produced when the rate of climb is close to, but has not yet reached the
specified Climb threshold (see 13.3.1). This value is set between 0 and 9 with each unit corresponding
to be 0.1 m/s, ie. 3 is 0.3m/s. Subtracting this decimal value from the climb threshold will give us
the value at which the NAV will start buzzing. For example with the NAV default values, Climb
threshold=0.1m/s, and Buzzer=3 (0.3m/s) the buzzing with start at -0.2m/s because 0.1 - 0.3=
-0.2. In this case at 0.1m/s directly below the Climb threshold the NAV will emit a constant sound
varying rapidly in pitch from around 100hz to the set base frequency at which the first beep is
emitted. This is the buzzer sound and may resemble a growl noise. Setting the Buzzer value to 0
will disable the buzzer feature.
Although the Buzzer will sound very annoying on the ground it becomes an amazing companion
in flight allowing the pilot to pick-up thermals he would have usually missed.
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