I want to buy a back-up flight recorder. 63 invalid fixes on a long
flight has convinced me that my Volkslogger won't always record the
flight with the required accuracy. (I had the battery replaced last
year but now I am having problems on about 1 out of 4 flights. The
pattern of invalid fixes is- 4, 2, 30, 0,63, 23,21,49, 8, 10)