Flytec 6015 * Manuel d'utilisateur télécharger pdf (Page 34)

Operation Manual Flytec 6015-GPS 32

9.3 Flight Memory and IGC File

9.3.1 Evidence of flights – Security against manipulation

The popularity of decentralized competitions has been growing enormously over recent years.

Meanwhile 26 countries have accepted the OLC (Online Contest) convention. These agreements

signify that any pilot can submit flights at will over the Internet for approval and evaluation.

The submission has to be compliant to IGC-format (WGS84) and must have a digital signature.

Inside the IGC file are saved all important data of the flight in readable form. The readout of the

IGC file is possible with any editor.

The FAI (Fédération Aéronautique Internationale) and is su/jointfilesconvert/1489204/bgroup IGC (International Gliding

Committee)

require a recording format which, while memorizing continuously the time of day, position

and also the flight altitude.

When transmitting flight data to the pilot’s PC, a so-called IGC-File is

created, which receives a digital signature (=G-Record), authenticating the flight data and making it

fraud-resistant. Although editing and altering is possible, if only one character of the file containing the

flight data would be changed, the signature would no longer be compliant to the data and the judging

committee would be aware of the manipulation.

Therefore the misuse is practically impossible.

The IGC file can be sent directly to the judging committee of the OLC via the Internet.

(At present, the OLC is evaluated in Germany by the DHV).

Since the proof of a completed flight depends entirely on the GPS recording, it is important to ensure

before take-off that the GPS-receiver indeed receives satellite signals. Therefore please switch-on

the 6015-GPS at least two minutes before take-off so that even pre-flight events are included in the

recording.

After completion of a flight this „Digital Signature“ is calculated autonomously by the

6015-GPS and subsequently attached to the flight data file as so-called G-record.

A correlative remark „Generating Digital Signature“ is displayed in the information field

of the instrument. As this calculation is extremely complicated, it may take several minutes

following a long flight with setting of a short scan rate. Please wait until this message will

disappear.

Sometimes it is helpful if one can import to Excel the raw data being stored in the IGC File in order

to practice own calculations. The document providing a detailed description can be downloaded

from the Flytec homepage

www.flytec.ch  Support  FAQ  IGC_File.pdf

More detailed information in regard to IGC Format is available on the FAI Website under:

http://www.fai.org/gliding/gnss/tech_spec_gnss.asp

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Flytec 6015 * Manuel d'utilisateur Page 34