http://flytec.com/software.html#air

Perhaps the most effective way to load airspace is to save a
properly formatted airspace file to an SD card located in your computer and then
insert the SD card into the flight instrument. In this case, you start with an
OpenAir .txt file and run it through a Flytec Utility to check for and remove
any formatting issues. After processing the .txt file it is given the suffix .faf
(Flytec Airspace Formatted) so that it will be recognized by the instrument.
This is essentially text file with some restrictions (necessary for the flight
instrument to properly interpret the airspace definitions).

OpenAir2faf utility v2.00 - Windows tool for preparing OpenAir files

OpenAir2faf utility v2.01 - OSX tool for preparing OpenAir files

With this method there is no limit to the number of airspaces that can be
accessed by the flight instrument. It simply loads the 100 closest airspaces as
needed. This occurs first a few minutes after the GPS acquires (depending on the
size of the airspace file) and then, in flight, the instrument will update the
active airspaces as needed.

The other benefit of this method is that you can save multiple .faf files to the
SD card and select the desired files when appropriate. For example, you can have
one for United States east coast and one for west coast, or you can have one for
each state or country you fly in.

The utilities for processing an OpenAir file is available for PC and Mac and can
be found here: http://flytec.com/software.html#air and above.  You can obtain OpenAir
files from http://soaringweb.org/Airspace/.

Once you have the desired OpenAir file on your computer you can process it with
one of the above utility and save it to anSD card as follows:

1. Insert SD card into your computer

2. Launch OpenAir2faf

3. Click the OpenAir file button

4. Browse to the location of the desired .txt file and click Open

5. Click the FAF file button

6. Browse to the CTR folder of the SD card and click Open

7. The path is now shown in the FAF File box

8. After… "CTR", add "/ up to 8 letter name for the converted file and .faf"
(e.g., .../CTR/USA.faf).

9. Click convert, the number of processed airspaces will be shown.

10. Properly eject SD card and insert into flight instrument (when it is either
off or in menu mode).

Note: Airspaces that have too many elements will not be converted. If you have
one of these in your flying area you can read the document here:
Reduce the number of corner points for instructions on how to reduce the
number of elements.