Open Source Flight Intrument Documentation [index]
The following requirements apply to the character based OSFI instrument (CBI). These requirements are in addition to the generic requirements and the LCD instrument requirements.
This is the default screen that appears after powering up the instrument.
Vario Average > + 3 1 0 ' < Vario Bar Graph Time > 1 2 : 3 4 : 5 6 ^ ^ < Increase Speed to Fly 1 1 0 2 4 ' 5 7 < Airspeed Wind Direction and Speed > 2 7 0 ° 1 8 < Decrease Speed to Fly Altitude ^
The fields are as follows.
| Vario Bar Graph | The graph occupies the first row of the
display and is centered about the centre of the row. It
represents the instantaneous rate of climb. Each
character represents 100ft/min (0.5m/s). The graph fills
from the centre towards the right margin as the rate of
climb increases. If the lift increases further, the graph
starts to clear again from the centre. Negative rates of climb are the same but in reverse ie. the graph fills from the centre towards the left margin. |
| Vario Average | This shows the rate of climb averaged over time. When the vario bar graph is occupying the right half of the first row, the vario average is shown in the left half, and vice versa. The units of the field are according to the "display units" user setting. |
| Airspeed | The instantaneous airspeed. The units of the field are according to the "display units" user setting. |
| Increase Speed to Fly | The number of up arrows appearing in this field indicates how much the glider's airspeed should be increased by in order to acheive the optimum speed to fly in the current conditions. |
| Decrease Speed to Fly | The number of down arrows appearing in this field indicates how much the glider's airspeed should be decreased by in order to acheive the optimum speed to fly in the current conditions. |
| Altitude | The units of the field are according to the "display units" user setting. |
| Time | When a GPS is not connected, this field
represents the time elapsed since turning on the
instrument. When a GPS is connected, this field represents the time of day. |
| Wind Direction and Speed | When a GPS is connected, this field represents the wind direction in degrees and wind speed in units according to the "display units" user setting. |
TBD: define actual character based screen layouts for this and other screens.