NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2015 Sep 16, 17:36 -0700
In an emergency as stated it would be wise to plot positions using each watch and assume to be at the position closest to danger while latitude sailing to the final destination. A second strategy would be to plot a round of stars with the Moon using both watches then selecting the watch that resulted in a Moon pin wheel fix. I seem to remember John S. Letcher using such a technique after his chronometer stopped.
Greg Rudzinski
From: David Pike
Date: 2015 Sep 16, 13:14 -0700
Can we live with a five-minute uncertainty in the time? If so, what would our procedures be? Better yet, how could you decide between the two? Both the owner of the digital watch and the owner of the camera swear that they set their devices to the correct time upon leaving port less than a week ago. One of them is right. What would you do?
Wheter we can live with five minutes uncertainty depends on your latitude and the Zn of the PLs. Personally, I’d complete two plots, one for each timepiece, expecting to see PL’s differing by 77 minutes of longitude E-W. I’d use the plot nearest my DR position (assuming there’d been no upheavals to the compass or log) , but always keep in mind that the alternate plot might be correct.
You have to admit.
