From: David C
Date: 2016 Jul 11, 02:34 -0700
To follow up your comment about phone time. I have been using my phone as my deck watch and my PC (which is set by NTP) as my chronometer. I had assumed that phone network time would be identical to my PC time but it isn't. The phone is typically 2 - 5 sec slow and can vary over a few hours. For example, early this afternoon I took some sights and the phone was 4 sec slow. I have just checked it and it is now 5 sec slow.
I have confirmed that the phone is set to use network provided date and time.
I have just restarted my phone and the error is now 0 sec. It seems that the date and time are set only on boot up, not regularly as I had assumed. I suspect that this is a function of my phone's OS (Android) and the time app I am using.
Do other phones show this behaviour?