Played a little bir around and found 2 work-arounds:

1. for the last turn set the follwing number from 1 to 2 - but integration in the script is quite tricky

2. repeating the line with the last turn increasing the turn number - integration in the script is simple, just add the folling line before the end line:

print OUTFILE "TURN $turn $lon $lat $turn 1 0 0 0 0.0 $desc\n";
print OUTFILE "END ......

This works.

Juergen