Flytec Balloon 4:Altitude adjustment

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Altimeter adjustment

The different altimeters

The Flytec Balloon 4's altimeter indicates altitude above mean sea level (MSL) or Flight Level. In flight mode, the altitude indicator is located at the top right of the display.

Press to cycle through the different altitude indications.

• Alt1: MSL altitude in meter (metric setup) or feet (imperial setup)
• Alt2: MSL altitude in feet (metric setup) or meter (imperial setup)
• FL: Flight level, based on QNE (1013 hPa / 29.91 inHg)

Setting QNH or launch altitude

Atmospheric pressure changes over time. Therefore, to get accurate MSL altitude information, the reference pressure or altitude must be set before every flight, and may need to be adjusted during a flight if required by air traffic control. The Flytec Balloon 4 does that automatically for you, but you can override this automatic adjustment manually.

Automatic adjustment

When you turn on your Flytec Balloon 4, as soon as GPS reception has been established, the vario determines its current GPS altitude, and uses this to automatically set QNH. In most cases, this will be sufficiently accurate. The altitude indicator blinks while this process is ongoing. Once launch has been detected, the last measured GPS altitude is used for the flight (unless changed manually) and the altitude indicator stops blinking.

Manual adjustment

In general, a long press on brings you to the QNH and altitude adjustment screen. Once in adjustment mode, you can use F2 () to toggle between pressure and altitude setting. There are four scenarios for using this screen:

1. You know the current barometric pressure calculated for sea level (QNH), as for instance given by an aviation weather report, or by air traffic control.
   1. Press and hold for three seconds.
   2. Use to adjust QNH in steps of 1 hPa / 0.01 inHg, until the value matches the desired reading.
   3. Notice how ALT1 is adjusted accordingly.
   4. Press to confirm your setting.
2. You know your present altitude, as for instance determined from a map, or an airfield marking, and that altitude differs from the altitude determined by GPS.
   1. Press and hold for three seconds.
   2. Press F2 () to switch to altitude adjustment.
   3. Use to adjust ALT1 in steps of 1 m / 1 ft, until the value matches the desired reading.
   4. Notice how QNH is adjusted accordingly.
   5. Press to confirm your setting.
3. You want ALT1 and ALT2 to indicate QNE altitude, based on standard atmosphere with 1013 hPa / 29.91 inHg.
   1. Press and hold for three seconds.
   2. Press F1 () to set QNH to 1013 hPa / 29.91 inHg.
   3. Notice how ALT1 is adjusted accordingly.
   4. Press to confirm your setting.
4. You want to cancel any previous adjustment and return to the automatic adjustment based on GPS altitude.
   1. Press and hold for three seconds.
   2. Press F2 () to switch to altitude adjustment.
   3. Press F1 () to set the altitude to the current GPS altitude, and continue adjusting as this measurement changes.
   4. Notice how QNH and ALT1 are adjusted accordingly.
   5. Press to confirm your setting.

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