From: Bob Goethe
Sent: October 27, 2017 5:54 PM
To: 'Bill Anderson'
Subject: NASA post script on accurate time
In addition to the methods I already mentioned, you SHOULD be able to get accurate time off your GPS receiver. It is certainly theoretically possible to get completely accurate time from GPS, but whether you do or not depends how your particular receiver has been designed.
On my Hawaii trip, both the skipper and I noticed that our GPS showed a time that seemed to drift fast or slow by several seconds, and to vary quite a bit from one day to the next. I think if you have some other means of getting accurate time, and can VERIFY that your GPS receiver is showing you accurate time, then you can trust it.
The relevant Russian proverb is “Doveryai no proveryai”: Trust, but verify.
"As I sail, I praise God, and care
Luke Foxe, Arctic Explorer, 1634
I desire no more delight
Than to be under sail and gone tonight.
Gratiano, in Act 2, Scene 6, The Merchant of Venice
By William Shakespeare, 1596
Some day you will read in the papers that D.L. Moody, of East Northfield, is dead. Don't you believe a word of it! At that moment I shall be more alive than I am now.
D. L. Moody (1837-1899)
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