Joerg Stieber wrote:
The VL is a relatively "dumb" logger and does not detect take off's etc. It
writes one file as long as it is turned on. If it gets turned off and on
again, it starts a new file. It never overwrites anything in its memory. If
the memory is full it just stops recording.

If this is the case, you can check that. Open the .igc file with notepad
and you will see something similar to:


B0910175243051N01031574EA0000000089
B0910255243051N01031575EA0000000089
B0910335243051N01031576EA0000000090
B0910415243051N01031575EA0000000091
B0910495243051N01031575EA0000000096
B0910575243051N01031575EA0000000096
B0911055243050N01031575EA0000000096
B0911135243050N01031574EA0000000097
B0911215243050N01031574EA0000000096
B0911295243050N01031574EA0000000096

A line that starts with "B", but others exist, is a log of one point.
The B lines above show a log at 09:10:17 hrs, 09:10:25 hrs, etc. So in a
B line, character 2 to 7 displays the time of the log. This way you can
manually inspect, and be 100% sure, which moments in time are logged.

The complete format is documented at www.igc.org,

David
NL