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View Poll Results: Keeping celestial nav skills alive
Never learned, too many sight reduction books to haul around 18 8.22%
Plan to learn, on the "to do list" 80 36.53%
Learned, but no longer practice 56 25.57%
Learned, but only practice to keep the skills 50 22.83%
The hubby/wife does it 1 0.46%
Learned, practice every chance for that perfect pin wheel 14 6.39%
Voters: 219. You may not vote on this poll

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Old 30-04-2012, 05:21   #286
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Re: The New and Improved Celestial Navigation Poll

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Originally Posted by deckofficer View Post
A bit easier on the deck of the 499' training vessel Golden Bear vs a small, private boat. We were encouraged to shoot quickly and many. A lot of 4, 5, lop pinwheels, with some 7 lop pinwheels. CMA was a rather competitive atmosphere. Around 20* N, near Hawaii, was my senior cruise CN course.
And what was the chart scale?
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Old 30-04-2012, 07:55   #287
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Re: The New and Improved Celestial Navigation Poll

Given a pencil trace thickness of 0.3 mm
At 1 : 500 000 scale
((0.3 * 500000)/1000)/1852 = 0.0809 nautical mile
At 1 : 150 000 scale
((0.3 * 150000)/1000)/1852 = 0.0242
At 1 : 80 000 scale
((0.3 * 80000)/1000)/1852 = 0.0129 nautical mile, now been at the centre of the trace, the lop’s should be 0.00645 nautical mile
Looking at a sheet from last year, sea calm:
1) 0.64 nm 2) 1.178 3) 0.287 4) 0.695 5) 0.195 6) 0.246
7) 0.246 8) 0.102 9) 0.187 10) 0.466 11) 0.297 12) land on the horizon.
Bugger, no pins wheel this time and surely never ever.
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Old 30-04-2012, 10:32   #288
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Re: The New and Improved Celestial Navigation Poll

Boy, you guys are hard case. A spoked pinwheel doesn't mean the all intersect at one point, but rather create a hub, like a bicycle wheel. No errant lops.
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Old 30-04-2012, 12:04   #289
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Re: The New and Improved Celestial Navigation Poll

We are more prudish we call it a cocked hat by the way what was the name of that ship? “Pinwheel cosmopolitan” (to google) it is definitely a case of head twist.
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Old 30-04-2012, 12:42   #290
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Re: The New and Improved Celestial Navigation Poll

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I don't know, doesn't using a sextant in this day and age make you feel a little like; ummmm.....

Nope. Makes me feel like:
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Old 30-04-2012, 14:59   #291
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Re: The New and Improved Celestial Navigation Poll

Ok fred I get, who's the guy in the wig , I feel I know this but....

dave
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Old 30-04-2012, 15:07   #292
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Re: The New and Improved Celestial Navigation Poll

Captain Cook. I would have used Bligh
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Old 30-04-2012, 15:42   #293
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Re: The New and Improved Celestial Navigation Poll

Odd, but Bligh, at least from portraits, appears considerably less stern than Cook.\

http://explore.moadoph.gov.au/milestones/1158
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Old 30-04-2012, 15:53   #294
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Re: The New and Improved Celestial Navigation Poll

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I don't know, doesn't using a sextant in this day and age make you feel a little like; ummmm.....
Ask any shrink. Nothing and nobody 'makes one feel'. What one feels is entirely a reflection of what they hold inside.

If driving a Harley makes you feel macho, do not blame Harley!

;-)
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Old 30-04-2012, 15:56   #295
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Re: The New and Improved Celestial Navigation Poll

And for those that feel good using sextants:

Bris sextant - Wikipedia, the free encyclopedia

provided kindly by:

Various

Love,
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Old 30-04-2012, 16:28   #296
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Re: The New and Improved Celestial Navigation Poll

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Odd, but Bligh, at least from portraits, appears considerably less stern than Cook.\

First Government House Site
I think a stern countenance may be a requirement for a portrait of an explorer such as Cook. In addition my guess was it was painted after the commission of his third voyage which, I understand, were it not for vanity he would not have, and should not have, embarked on.
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Old 01-05-2012, 15:10   #297
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Re: The New and Improved Celestial Navigation Poll

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Pinwheel, when you shoot 6 or 7 stars and all your LOP's when drawn form a pinwheel with all LOP's crossing at the same point.
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Originally Posted by deckofficer View Post
Boy, you guys are hard case. A spoked pinwheel doesn't mean the all intersect at one point, but rather create a hub, like a bicycle wheel. No errant lops.
There is a serious “Concordia” coming from the bridge there. I can do a perfect pinwheel with a radius of 20nm now, if due to clouds coverage I get only one sight then I am 20nm out. If a cocked hat of 1/2nm across can be accepted as a fix by crossing bearings, I go along with.
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One nautical mile is not bad Nick, up to two is acceptable. A skilled operator using a top of the line sextant from a fairly steady ship can get within .25nm, but most of us on a small boat will be lucky to get within 1nm.
If I remember Fred (yabba dabba doo) had a rock solid car, no ecu to go wrong. A 1938 sextant still in use demonstrates great reliability and low cost. Last year 2 weeks from port I had two MFD packing up at the same time (no lightning). One started rebooting every 4 minutes, the other, 1 ˝ year old and still under warranty, all his control buttons became inoperative and got stuck on the disclaimer screen and at this day still is. As unreliable, they are both good for the dump, which means I will have also to replace the radar too. In that type of situation it is good to have an exit strategy.

On a lighter note why is it that we have 8 entries striving for perfect pinwheel position an only 1 for The hubby/wife does it?
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Old 01-05-2012, 15:23   #298
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Re: The New and Improved Celestial Navigation Poll

Yeah Astrid....Cook looks likes he smells something unpleasant....or..maybe he can't read a chart...LOL
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Old 01-05-2012, 15:37   #299
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Re: The New and Improved Celestial Navigation Poll

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There is a serious “Concordia” coming from the bridge there. I can do a perfect pinwheel with a radius of 20nm now, if due to clouds coverage I get only one sight then I am 20nm out. If a cocked hat of 1/2nm across can be accepted as a fix by crossing bearings, I go along with.

You got me. How about the scale being a 16" beach ball globe and your drawing your LOPs with a 1/8" wide magic marker?
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Old 01-05-2012, 16:20   #300
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Re: The New and Improved Celestial Navigation Poll

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How about the scale being a 16" beach ball globe and your drawing your LOPs with a 1/8" wide magic marker?
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And what was the chart scale?
That was the point.
All best.
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