Galaxy S4 updated to Android 4.3 over the weekend.
GPS appears to be working - signal can get my location at home/office. But when going into Google Maps -> to Navigation (turn by turn the phone is not working - displaying "Searching for GPS" message. Toggling GPS on/off tries to get updated location, but can be way off (over 1 miles), routes for driving directions, then freezes - not updating, no voice after initial "turn left/right ..." to start route.
GPS and driving directions in Maps worked fine prior to update. - also installed Samsung Knox after the update, so will uninstall and see if that helps.