** About
This document was created by Steven Baltakatei Sandoval on
~2020-07-23T22:27Z~ under a [[https://creativecommons.org/licenses/by-sa/4.0/][Creative Commons BY-SA 4.0 license]]. It was
-updated by Steven Baltakatei Sandoval on ~2020-10-18T00:11Z~
+updated by Steven Baltakatei Sandoval on ~2021-01-25T00:32Z~.
** Narrative
The ~ninfacyzga-01~ device is equipped with an Ozzmaker BerryGPS-IMU
-module which provides time and location data to ~gpsd~ and ~chrony~. The
-time is provided by GPS satellites which themselves are
+module which provides time and location data to ~gpsd~ and
+~chrony~. The time is provided by GPS satellites which themselves are
equipped [fn:nasa_20020408_atomicclock] with atomic clocks. This
-extremely accurate set of clocks are needed since a GPS receiver
-calculates its position in space using a General Relativity
+extremely accurate set of clocks is needed since a GPS receiver
+determines its position in space using a [[https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_Positioning_System#Special_and_general_relativity][General Relativity]]
calculation that uses the small variations in the time stamps received
from each satellite. This means that ~gpsd~ may be used to set the
system clock without a need for an internet connection to a default
*** Initial Startup
**** Perform initial setup.
See [[file:../setup/README.org][Main Setup]] procedure.
+
**** Install Hardware for time tracking
See [[https://ozzmaker.com/forums/topic/connecting-gps-pps-pin/][this]] Ozzmaker forum topic about connecting the BerryGPS-IMU
~T_PULSE~ pin to GPIO 18.