After a longer test I get the following results:
-466.385 s (the Pico is counting a bit faster than the Gps) on a gps duration of 46190 s: so -0.0101 % of error having used E.setRTCPrescaler(29536); before the sync of gps's time and pico's time.
So i expect no drift is I use E.setRTCPrescaler(29534); or more precisely E.setRTCPrescaler(320000.923(1+466.385/46190));
Let's get started again with this!
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