That's why in Belgium's proposal, the files of both the primary and secondary logger need to be submitted every day. If there is a difference between the two loggers in event marker push of more than 1 minute, a penalty is given.

There is also another method possible in which the primary logger is the only logger that counts, unless proof is given that that primary logger has malfunctioned. If that proof can not be given, a penalty is given.

What the exact best procedure is, needs still some trying out and debate as well, but I do not think this will be to much of a problem.