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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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  #11  
Old 12-09-2010
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My Rolex loses a bit more than a minute per week. I use an older Timex digital for CN.
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  #12  
Old 12-09-2010
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lets do an experiment!!! ill put it up in 'Gear and M.'
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  #13  
Old 12-09-2010
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Quote:
Originally Posted by QuickMick View Post
lets do an experiment!!! ill put it up in 'Gear and M.'
... and post a link?
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  #14  
Old 12-09-2010
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DOH

Watch Experiment
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Old 12-09-2010
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If you are out on the ocean self contained using a sextant then radio time signals or pathfinders with auto update are out-the auto update is anyway only of use basically in continental/coastal USA;Europe;antipodes etc-doesnt work mid ocean.
If you are relying on outside updates then use your GPS!
The casio pathfinder does not maintain accurate enough stand alone time-I have a non radio one-in fact my grandfathers pocket watch circa 1900 does better.
You can get accurate watches but they cost and a proper marine chronometer can cost £$1000 plus!
Basically modern watches unless you pay a lot are no good unless you are only "playing" at Celestial navigation.
My pathfinder is great if I can reset it from my laptop every few days.
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Old 12-09-2010
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Quote:
Originally Posted by QuickMick View Post
is your rolex less accurate? just curious...
The Rolex is not even close. It's a fairly classic model (Air King Perpetual), and an amazing piece of self-winding & self-regulating time-keeping, but it can't hold a candle to an oscillating quartz crystal.

I'm generally in the middle east for a month or so in the summer, and even without the auto sync to US or Europe (similar beacons are in UK and somewhere on the continent as well, maybe France?) the Casio is never off by more than a second (maybe two at the outside).
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Old 12-09-2010
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I am confined to the near off shore East Coast of the US, and try to use both a time cube and my hand held 72 GPS to set my Casio wrist watch. Total cost for the previous three: is less than $150. My biggest error is in reading my Plath sextant on a rocking deck of a 25' sloop. I use both the NASRM and calculator to reduce sites, then check precision with the 72.
The $21. Casio gains ~2 seconds in 9 days, but still try to check daily.
Taking sites on the beach brings me consistently within 1/4 mile. Off shore in my boat it is more like a 3-5 mile triangle in relatively calm seas.

Dick
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Old 12-10-2010
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Originally Posted by Flybyknight View Post
I am confined to the near off shore East Coast of the US, and try to use both a time cube and my hand held 72 GPS to set my Casio wrist watch. Total cost for the previous three: is less than $150. My biggest error is in reading my Plath sextant on a rocking deck of a 25' sloop. I use both the NASRM and calculator to reduce sites, then check precision with the 72.
The $21. Casio gains ~2 seconds in 9 days, but still try to check daily.
Taking sites on the beach brings me consistently within 1/4 mile. Off shore in my boat it is more like a 3-5 mile triangle in relatively calm seas.

Dick
It seems that you need to work out your personal sextant error and apply it to the sextant. Some people do have that error, could be in their eyes or brain but it is there.
Mine was 0.15.
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Old 12-12-2010
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It is intriguing that the further some people are out to sea, the more accurate they want their timing to be. Shouldn't you be able to find local noon anywhere pretty accurately with a sextant? If you're 500 miles from shore, what difference does 20 or 50 miles make? Accuracy is most needed when you're closer to the rocks - but you should be able to see the shore if you're that close. If it's too foggy, you're not going to be sighting much through a sextant either. Slocum used a hand-wound alarm clock, and probably erred on the side of caution.
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Old 12-12-2010
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I use a solar-powered chronograph from Citizen. It is one of their Eco-Drive models, which does not require changing a battery. I've had it for over 12 years and it keeps time to about 1 sec/month or so.
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