Altair Glide Computer and Navigation System User Manual Page 121

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XCSoar User Manual
Next L/D
WP L/D
The required glide ratio to reach the next waypoint, given by
the distance to next waypoint divided by the height required to
arrive at the safety arrival altitude. Negative values indicate a
climb is necessary to reach the waypoint. If the height required
is close to zero, the displayed value is ’—’.
L/D vario
L/D vario
Instantaneous glide ratio, given by the indicated airspeed di-
vided by the total energy vertical speed, when connected to
an intelligent variometer. Negative values indicate climbing
cruise. If the total energy vario speed is close to zero, the dis-
played value is ’—’.
10.4 Variometer
Thermal last 30 sec
TC 30s
A 30 second rolling average climb rate based of the reported
GPS altitude, or vario if available.
Last Thermal Average
TL Avg
Total altitude gain/loss in the last thermal divided by the time
spent circling.
Last Thermal Gain
TL Gain
Total altitude gain/loss in the last thermal.
Last Thermal Time
TL Time
Time spent circling in the last thermal.
Thermal Average
TC Avg
Altitude gained/lost in the current thermal, divided by time
spent thermaling.
Thermal Gain
TC Gain
The altitude gained/lost in the current thermal.
Vario
Vario
Instantaneous vertical speed, as reported by the GPS, or the
intelligent vario total energy vario value if connected to one.
Netto Vario
Netto
Instantaneous vertical speed of air-mass, equal to vario value
less the glider’s estimated sink rate. Best used if airspeed, ac-
celerometers and vario are connected, otherwise calculations
are based on GPS measurements and wind estimates.
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