Re: [gpsd-dev] RaspbPi HOWTO

[Frank]

On May 3, 2016, at 1:22 PM, Hal Murray <address@hidden> wrote:

address@hidden said:

The GPS Hat should just work.  The GPS Hat will also provide an RTC for both
the ODroid and the RPi.

Is there really a RTC on a GPS HAT?  Which one?

The battery is to keep the RTC equivalent inside the GPS chip going.  It's
the difference between cold start and warm start.  That clock is not normally
available to the outside world.


--
These are my opinions.  I hate spam.

Hal is correct.  Quoted from Adafruit (https://learn.adafruit.com/adafruit-ultimate-gps-hat-for-raspberry-pi/battery-backup):

--------------------------------------------

Battery Backup

by lady ada

The GPS has a built in real time clock, which can keep track of time even when it power is lost and it doesn't have a fix yet. It can also help reduce fix times, if you expect to have a flakey power connection (say you're using solar or similar).  To use the RTC, we need to insert a battery. There is holder on the HAT for a CR1220 sized battery holder.