If the SD-Card is lost, not readable, or if no IGC files can be found on the card, there is still hope! The logger stores all tracks in its internal flash memory. The memory has space for at least 5h (@1s interval). Old data is automatically overwritten.

To download the track from the logger use the BLM.

1. Start the logger. Press Ok
2. Do not enter QNH. As soon as QNH is entered, the logger starts recording and might override the track that you are just looking for.
3. Connect the logger to the PC.
4. In BLM select “Logger”–>”Download Track”. Follow the instructions on the screen.

GPSBabel is a free software tool that can be used to convert different track file formats. It can be downloaded from gpsbabel.org.

Convert to different file formats
The following command converts a logger igc file into a OziExplorer plt file. Please note, that 2 files are written. output.plt is the file with barometric altitude while output-1.plt uses GPS (above MSL) altitude.
gpsbabel -t -i igc -f -o ozi -F output.plt

The above example generated OziExplorer plt files. GPSBabel supports many track file formats.

A list of all supported formats is listed on the GPSBabel homepage.

QNH correction
The logger stores the barometric altitude with QNH=1013.25. In order to adjust for the real altitude the barometric altitude must be corrected using the following formula:

This can also be done with GPSBabel:
gpsbabel -t -i ozi -f output.plt -x height,add=[dalt] -o ozi -F output-2.plt
with [dalt] beeing delta alt as calculated in the first line of the formula above. Of course the above line can be called with different file formats as well.