I had similar problems with my GPS when I first got the phone. Turned out it was the SD card I was using. Swapped it out for a different card and the problems went away.
Only thing i did was wipe my device cache after the update. But i also didnt check to see if i had an issue before i did the wipe. BTW... doing that made my phone much better in general post update.
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My note 4 shows the same as yours. I understand what you are trying to do but it looks like maybe you will need to set a reminder or calendar event for alarms outside of "today"