dr-o:
I See No Problem in Reading 433 MHz Signal ans GPS at the Same Loop, as Long as your Loop between two GPS readings dont Take longer than roughly 1 second.Did you tried to Set init timestamp and then using millis()? This should bei totally fine. Please consider: millis() overflows after roughly 50 days
Great! Yes, I use millis() quite often instead of delay() where I need non-stop monitoring of someting. The 50 day overflow is a non-issue for me as I never measure times that long and if you measure time difference it does not matter if it overflows between start and stop which is perfect for me. Thanks again!