“Would be very good if I was able to sync gps time with raspi pi stretch 3 or Zero - have been trying for 3 days with no success - we need a good easy to follow definitive stretch guide to get this done efficiently - using gpsd and no problems with that - need to use gps rtc clock and pps as no internet available for this project in its final form (using internet to upgrade/update and download programs OK) and than I need to use python to calculate sunset and sunrise and other data - all in php for use with html and mariadb.- but, all in all these are great pieces of hardware for development and prototyping my sort of projects. If you would like to offer any advise it would be appreciated - thanks Paul W”