A supported 64-bit Linux has officially arrived on the Raspberry Pi 3.  Because 
it is SUSE Linux Enterprise Server, I expect it to be more stable (fewer 
changes) than Raspbian (if SLES/SLED is any indication).  SLES is offered at no 
cost with a free subscription for a year of updates.  SUSE forum posts indicate 
after the year is up, that another free year of updates can be applied for, 
instead of paying for a subscription.  SLES does include Systemd, and I’m not 
about to try and rip it out (as much as I dislike it).  I’ll be using SLES as 
distributed.

I dedicated one of my Pi 3s to SLES, and am working on the toolchain to build 
GPSd & NTPsec.  I have a less expensive ($24.95 USD vs. $39.95 USD) version of 
the GPS chip that is on the Adafruit Ultimate GPS (MT3339).  The Microstack GPS 
module can be used just like the Adafruit Ultimate GPS breakout board, without 
the Microstack base board.  I also found some more documentation for another 
package of the actual GPS chip (Quectel L80 - linked below).

I’ll post back after I get GPSd & NTPSec to build.

SLES on Raspberry Pi documentation links & announcements:
https://www.raspberrypi.org/blog/suse-linux-enterprise-server-for-raspberry-pi/ 
<https://www.raspberrypi.org/blog/suse-linux-enterprise-server-for-raspberry-pi/>
https://www.suse.com/communities/blog/suse-linux-enterprise-server-raspberry-pi/
 
<https://www.suse.com/communities/blog/suse-linux-enterprise-server-raspberry-pi/>
https://www.suse.com/documentation/suse-best-practices/sles-rpi-quick/data/sles-rpi-quick.html
 
<https://www.suse.com/documentation/suse-best-practices/sles-rpi-quick/data/sles-rpi-quick.html>
https://www.suse.com/documentation/sles-12/ 
<https://www.suse.com/documentation/sles-12/>

Microstack GPS (same MT3339 chip as Adafruit Ultimate GPS, but less expensive - 
$24.99):
http://www.mcmelectronics.com/product/MICROSTACK-2434228-/83-16406 
<http://www.mcmelectronics.com/product/MICROSTACK-2434228-/83-16406>
http://www.microstack.org.uk/products/microstack-gps/ 
<http://www.microstack.org.uk/products/microstack-gps/>
http://www.newark.com/microstack/microstack-gps/add-on-board-l80-gps-raspberry/dp/78X5851
 
<http://www.newark.com/microstack/microstack-gps/add-on-board-l80-gps-raspberry/dp/78X5851>
http://www.microstack.org.uk/assets/gps/FormattedGPSgettingstarted.pdf 
<http://www.microstack.org.uk/assets/gps/FormattedGPSgettingstarted.pdf>
http://www.quectel.com/UploadImage/Downlad/Quectel_L80_GPS_Presentation_V1.1.pdf
 
<http://www.quectel.com/UploadImage/Downlad/Quectel_L80_GPS_Presentation_V1.1.pdf>

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