The main window of the application is designed to run full-screen on any display. If you’re using HD goggles, you may have to select a specific resolution in the Mac display settings. It is recommended to change the desktop to the same resolution, especially when using external recording equipment like the “Hyperdeck Shuttle” to record your session.
The video screen displays a H.264 720p video transmitted using UDP multicast.
If you have the required telemetry hardware and activated the telemetry data link, the OSD can be displayed and this is divided into four different components:
- The top information bar
- The bottom information bar
- The HUD screen
- The virtual tunnel
The top information bar contains the technical details and displays mostly raw telemetry information. It is useful to get direct readouts of what the vehicle is transmitting.
- Battery information : Voltage, current draw and battery consumption
- GPS satellite : Raw data readouts of position, altitude, ground speed, course and the number of satellites currently in view and used for data collection
- Fan : The airspeed in m/s
- Antenna : The RSSI of the radio and the RSSI of the video tx
- Thermometer : The temperature at the vehicle
- Servo : The raw readouts of four selected onboard servos
The bottom information bar is a different interpretation from the same raw telemetry data. For a number of operational tasks the direct concerns to a pilot are not the exact voltage in a battery, but something what is called an “affordance” or “budget”, whether there’s enough energy in the battery to make it home. Another example is airspeed, where it’s more important to determine if the airspeed brings a vehicle close to stall.
These concerns when it comes to driving or flying are displayed below and these are as follows:
- Radio : Displays the strength of the control signal of the vehicle. This is based on RSSI information from the telemetry. The telemetry should output 0 to 100 as readings between “radio off” and “strongest signal possible”. FPV uses “30″ as the lowest responsible minimum, so the bottom of the bar displays that. For video signals, the bar minimum is set to the measured noise floor.
- Gas tank : Displays the budget left for cruising around aimlessly before a straight path home must be initiated. This is based on energy consumed vs. energy contained in the battery set in the preferences.
- Camera : The video signal strength. Some wifi modules can be queried for both noise floor and signal strength. The first bar at 0 is then the noise floor.
- House : The distance to home.
- Seagull : An indicator of altitude. If the bar is next to empty, you’re getting too close to the ground. The bar fills up with a green color for altitudes between home altitude and the maximum altitude. If the bar is full and altitude increases, the bar turns red, indicating too high altitude.
- Wing lift : This is a relatively crude stall indicator. It monitors vertical speed and forward airspeed and determines if the angle of attack is dangerously close to causing a stall. This bar is still subject to further research and investigation, so it should not be used to fly IFR.
The displayed video and the application respond to only a couple of keys, which are listed below:
- T : Show/hide the top OSD bar
- H : Show/hide the HUD display
- B : Show/hide the bottom OSD bar
- U : Show/hide the virtual tunnel