A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Francis Upchurch
Date: 2016 Dec 31, 16:46 -0000
Thanks for the heads up on Hamilton Railroad watches.
They still look to be mostly over 300$ on ebay. So only relatively budget sensitive.
Do you have any knowledge or experience of the Russian copies like MOLNIJA which are on ebay for 30-40$ Also, a while back you discussed the US airplane 8 day clock as recommended by Letcher?
From my own experience, my modern Chinese made Rotary Retro look watch, (about 100$ 10 years ago, now about !30$) if worn constantly, (presumably providing consistent movement and temperature) has a regular rate of -15 secs per day and over a test period of over a month, using predicted rate, performed within the requirements of the longitude prize. (It is water proof to 50m and self winding)
Also, if I was going on this trip, I would probably take a Seiko mechanical dive watch circa 150$. (probably 2 of them). Shake, drop, water , bullet and probably lightning proof.
If we have SW radio time checks, time is not going to be a problem is it?
In addition to my Bygrave, could I take my Fuller as well (Fuller 2 still made in 1960’s). That would do most calculations to 4-7 decimal places.
I would also take HO 208 and Fletcher ,+ Hewitt’s commonsense to get me out of left field problems. (is Doniol allowed? Recent but based on pre 1960s knowledge?) I would probably also do lunars using Thompson abbreviated method with my Fuller.
Main problem for me ,is I could have probably done this 10 years ago, (and had the right boat then!) but not now. (dream on! Lesson , Cape Diem! Now, not some time in the future!)
Happy new year all.
The Hamilton 992B Railroad Special can serve as a cost effective mechanical marine chronometer for celestial navigation if kept horizontal at constant temperature. See link:
1970 was the last year of production so if a sailor trys to use one for CN then it should be serviced by a professional (good for five years) then rated in the position as secured onboard before a journey/race. This would be a cost saving choice to consider as a small craft racer in the 2018 Golden Globe Race.