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Thread: Sign of the times.
Post: Sign of the times.
| I just thought I'd check in to see if anyone has been using their sextants lately.
It's rainy season in pi so the number of observation days is limited, but I vow to get something this week even i... |
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pabrides |
General Topics Here
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1 |
1,967 |
06-24-2021, 12:42 PM |
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Thread: Sun gone in hiding
Post: Sun gone in hiding
| Hello shipmates,
Just stopped by to see if anyone is around. Rainy season here so taking shots is less frequent. I hope you guys are more fortunate.
Joe |
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pabrides |
General Topics Here
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1 |
1,972 |
05-14-2021, 11:41 PM |
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Thread: The sun is shrinking - really
Post: The sun is shrinking - really
| Not so... as far as I know...
I'm just faking a post to see if anyone is paying attention.
Cheers |
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pabrides |
Humor & Laughter
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0 |
1,490 |
04-01-2021, 08:32 AM |
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Thread: new artificial horizon
Post: RE: new artificial horizon
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craigsl Wrote: (03-02-2021, 12:34 AM)
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How'd it work out for you, Pabrides?
Sounds very interesting the workable.
Craig
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Works ok... my eyes are a bit old so a string is a bit of a challenge, ... |
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pabrides |
The Sight Reduction process
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3 |
3,708 |
03-02-2021, 04:04 AM |
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Thread: new artificial horizon
Post: new artificial horizon
| Try to imagine this, shipmates.
I plan to make a sort of horizon in my yard.
My plan is to use a long clear plastic thin hose filled with water to help mark a spot on my fence. The 2 hose ends will... |
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pabrides |
The Sight Reduction process
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3 |
3,708 |
02-27-2021, 07:11 PM |
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Thread: WANTED
Post: WANTED
| Hello shipmates,
I dont seem to have any opportunity to get star or planet shots
I do sun shots all the time with occasional moon shots, but star and planet shots I get none.
Please get a star or p... |
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pabrides |
The Sight Reduction process
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1 |
2,120 |
02-26-2021, 04:52 AM |
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Thread: warning - graphic content
Post: RE: warning - graphic content
| Thank you each, Clen and Ed, for your comments.
It becomes easier every day to see the evil in the world, and no one is perfect, but this frank reed clown who has a great influence in the marine worl... |
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pabrides |
General Topics Here
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4 |
4,302 |
02-21-2021, 07:00 AM |
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Thread: warning - graphic content
Post: warning - graphic content
| Quick note.
The following is a quote from Frank Reed who apparently owns NAVLIST and Reednavigation.com.
This is his very racist and offensive opinion of Filipinos.
_______________________________... |
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pabrides |
General Topics Here
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4 |
4,302 |
02-20-2021, 05:33 AM |
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Thread: UP FOR A CHALLENGE?
Post: UP FOR A CHALLENGE?
| Ahoy shipmates,
Years ago before being given a fine antique sextant by a working Italian captain who I will never forget, thank you Diego, I experimented with home made devices to get altitude. Some... |
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pabrides |
The Sight Reduction process
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0 |
1,314 |
02-19-2021, 06:06 AM |
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Thread: Star of India navigation
Post: Star of India navigation
| Pretty good stuff...
A brief sail aboard Star of India with nav processes explained laymen style.
However, although the cross staff was used as shown looking directly into the sun, I don't believe t... |
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pabrides |
General Topics Here
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2 |
3,719 |
02-18-2021, 05:48 PM |
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Thread: Fid - dly stixs
Post: Fid - dly stixs
| Hello shipmates
You may have seen the post of my DIY compasses, so you may have wondered what happened to the leftover piece of triangular brass. Well, I finally decided to either throw it out or ma... |
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pabrides |
General Topics Here
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1 |
2,508 |
02-17-2021, 01:12 PM |
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Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
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CarlosPindle Wrote: (02-12-2021, 12:47 PM)
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pabrides Wrote: (02-12-2021, 07:51 AM)
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Fred_B Wrote: (02-12-2021, 01:19 AM)
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Had no idea the magnetic pole moved that much. Speaking of compasses... |
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pabrides |
The Sight Reduction process
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7 |
7,925 |
02-16-2021, 12:16 PM |
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Thread: ARTIFICIAL HORIZON MATH
Post: RE: ARTIFICIAL HORIZON MATH
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c_davidson Wrote: (02-16-2021, 01:41 AM)
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Now you fellas have me confused.
To account for IC when using an AH what are we supposed to do?
Thanks,
Clen
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Lol, Clen,
Apply index correction to A... |
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pabrides |
The Sight Reduction process
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4 |
4,104 |
02-16-2021, 11:36 AM |
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Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
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Fred_B Wrote: (02-12-2021, 01:19 AM)
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Had no idea the magnetic pole moved that much. Speaking of compasses- compasses that are useful in one hemisphere (Northern or Southern) are useless in anothe... |
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pabrides |
The Sight Reduction process
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7 |
7,925 |
02-12-2021, 07:51 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
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craigsl Wrote: (02-12-2021, 02:25 AM)
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pabrides Wrote: (02-10-2021, 03:52 AM)
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@Rumata
Whats the story on that Bombard crossing?
BTW... why do the reply and quote buttons not work?
Cheers
-... |
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pabrides |
General Topics Here
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12 |
10,160 |
02-12-2021, 06:55 AM |
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Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
| I have a local marine map dating a few years. It's compass rose says 0 degrees difference between true north and magnetic.
Yesterday I was reviewing some nautical maps of my area on openseamap.org.... |
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pabrides |
The Sight Reduction process
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7 |
7,925 |
02-11-2021, 07:56 AM |
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Thread: NO ATHEISTS IN A STORM
Post: NO ATHEISTS IN A STORM
| Just Like the lack of atheism in foxholes, there are no atheists in a storm at sea.
No one knows this better than the author of THE SQUARE RIGGED CRUISER.
http://www.survivorlibrary.com/library/th... |
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pabrides |
General Topics Here
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2 |
3,503 |
02-11-2021, 06:07 AM |
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Thread: ARTIFICIAL HORIZON MATH
Post: RE: ARTIFICIAL HORIZON MATH
| Hello Larry
I just got it... I was making some wrong assumptions within the example about the absolute angle between objects when there is index error.
I worked it out graphically and came to the r... |
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pabrides |
The Sight Reduction process
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4 |
4,104 |
02-10-2021, 06:53 PM |
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Thread: ARTIFICIAL HORIZON MATH
Post: ARTIFICIAL HORIZON MATH
| It's probably an old discussion, but I still dont have this clear in my head
Of course we all know that using an artificial horizon doubles the actual elevation of a body which at some point requires... |
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pabrides |
The Sight Reduction process
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4 |
4,104 |
02-10-2021, 11:13 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
| @Rumata... if I was his wife I'd be pretty pissed off. |
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pabrides |
General Topics Here
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12 |
10,160 |
02-10-2021, 05:20 AM |
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Thread: AH HA MOMENT
Post: AH HA MOMENT
| I was debating whether to call this post ah ha moment or IM SO STUPID.
Its been raining for days around here so when the clouds took a break yesterday I quickly grabbed the sextant, a plate of vegeta... |
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pabrides |
The Sight Reduction process
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0 |
1,385 |
02-10-2021, 04:58 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
| @Rumata
Whats the story on that Bombard crossing?
BTW... why do the reply and quote buttons not work?
Cheers |
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pabrides |
General Topics Here
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12 |
10,160 |
02-10-2021, 03:52 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
| Good one Craig...
I suppose id have to include the chronometer because I said a boat load of nav stuff. However you wouldnt know the day or if the watch was accurate.
Nav texts would help though.... |
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pabrides |
General Topics Here
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12 |
10,160 |
02-09-2021, 04:51 PM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| If you have a chapter on how to use meridional parts that would be helpful. Or perhaps you could explain instead.
Thanks |
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pabrides |
General Topics Here
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11 |
9,382 |
02-09-2021, 06:31 AM |
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Thread: THINK ABOUT IT
Post: THINK ABOUT IT
| If I disoriented you beyond doubt, so that you didnt know your location on earth, and if I dropped you in some ocean;
1... could you determine your approximate location, say within a few hundred mi... |
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pabrides |
General Topics Here
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12 |
10,160 |
02-07-2021, 02:40 PM |
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Thread: Apparent time
Post: RE: Apparent time
| Ive never tried to ascertain longitude or latitude with a noon shot, but I am aware that LAN is not always LAN. The sun, as I recall, is sometimes advanced or retarded of clock noon if I'm thinking ... |
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pabrides |
General Topics Here
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3 |
3,290 |
02-06-2021, 08:41 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Here is the closest thing I could find to the Hyatt book
http://www.survivorlibrary.com/library/the_mathematics_of_navigation_1921.pdf |
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pabrides |
General Topics Here
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11 |
9,382 |
02-03-2021, 09:24 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Great reply,
but I can think of a circumstance in which 4 or more slide rule places might come in handy - such as if i should lend 347,250 and need to know my exact return at 3.72%. I'd want a slide... |
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pabrides |
General Topics Here
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11 |
9,382 |
02-03-2021, 07:37 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Good on you.
Dutton is a big name in marine circles. To accept one of his books left on the garbage was smart - as long as the book doesnt smell too bad...
The other book sounds familiar but I just... |
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pabrides |
General Topics Here
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11 |
9,382 |
02-03-2021, 05:39 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Nice to hear about the publications, shipmate. Something I'd be very interested in investigating.
Just because their math techniques seem antiquated doesnt mean they were wrong. Just last night ... |
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pabrides |
General Topics Here
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11 |
9,382 |
02-03-2021, 03:53 AM |
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Thread: compass rose revised
Post: RE: compass rose revised
| I revised the post with additional comments for clarity |
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pabrides |
General Topics Here
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2 |
2,812 |
02-02-2021, 06:05 AM |
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Thread: compass rose revised
Post: compass rose revised
| Hello Shipmates,
I've been playing around trying to learn the old compass rose. I found out a few things and developed some memory aids. Drawing my own compass helped tremendously. See attachment.... |
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pabrides |
General Topics Here
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2 |
2,812 |
01-31-2021, 10:12 AM |
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Thread: diy dividers
Post: diy dividers
| Just finishing making some dividers out of old brass flat stock I've had for 10 years.
I hand sawed the brass into long wedges, used a small file to get it in shape, used some old aviation hardware ... |
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pabrides |
General Topics Here
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0 |
1,560 |
01-27-2021, 08:40 AM |
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Thread: new sun sight
Post: new sun sight
| GMT jan 15 2021, 06 23 56, Ho 41 33.5
My fix is exactly 10 nm SE along LOP 3.
I took 3 AH sightings and averaged them. Learning to average hexadecimal was a bit tricky, but I found that making th... |
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pabrides |
The Sight Reduction process
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0 |
1,465 |
01-16-2021, 02:07 AM |
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Thread: Navigation and other Marine Applications for SRs
Post: RE: Navigation and other Marine Applications for S...
| Good day shipmates,
I got my new slide rule the other day: Hemmi 259D < $14 + $3 shipping
It was so unused and pristine I needed to lubricate the slide and do a general alignment.
What a ... |
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pabrides |
General Topics Here
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3 |
3,878 |
01-12-2021, 04:08 AM |
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Thread: Navigation and other Marine Applications for SRs
Post: RE: Navigation and other Marine Applications for S...
| Yes Fred, the SR does that which the electronic calculator can't do, that is to display visually a range of ratios or proportions at a glance. M:N :: O:P or M/N to O/P
ex: 2 is to 3 as 4 is ... |
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pabrides |
General Topics Here
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3 |
3,878 |
01-04-2021, 09:19 PM |
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Thread: Navigation and other Marine Applications for SRs
Post: Navigation and other Marine Applications for SRs
| I'm not sure how many here remember the slide rule (SR). if you were in high school in the 60s then you would probably have some experience.
I went to HS in the 70s and never heard of the SR. On... |
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pabrides |
General Topics Here
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3 |
3,878 |
01-04-2021, 05:27 AM |
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Thread: Dead Reckoning
Post: RE: Dead Reckoning
| @Paul.
I was intrigued with your Dutch log trick in ascertaining boat speed. I'm very fond of slide rules (SR) in general but especially in how they may be applied to marine use. SRs have been us... |
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pabrides |
General Topics Here
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3 |
3,742 |
01-02-2021, 09:32 PM |
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Thread: Dead Reckoning
Post: RE: Dead Reckoning
| As long as the boat has forward speed of at least a knot my log line method will take no longer than 35 seconds. But at the cruise speed of a midsized yacht, say 7 knots, the line will fully extend ... |
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pabrides |
General Topics Here
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3 |
3,742 |
12-29-2020, 12:19 PM |
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Thread: Dead Reckoning
Post: Dead Reckoning
| I was playing with some math today figuring out the best way to use my E6-B flight computer for marine applications. Somehow my mind went to log lines and sand timers.
I got the idea that with to... |
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pabrides |
General Topics Here
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3 |
3,742 |
12-29-2020, 06:32 AM |
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Thread: Frustration
Post: RE: Frustration
| When I lived in the keys the guy I worked for told me there were abandoned boats all over the Caribbean. I was a marine electronics tech at the time and kept my ears open but I never caught wind of ... |
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pabrides |
General Topics Here
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2 |
2,819 |
12-28-2020, 06:12 PM |
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Thread: Frustration
Post: Frustration
| Its 22 14 00 gmt dec 27. That's 06 23 00 local. I was up before nautical twilight to shoot venus, spica, and perhaps regulus, but there was complete overcast. Now that rainy season is over we're g... |
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pabrides |
General Topics Here
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2 |
2,819 |
12-27-2020, 10:35 PM |
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Thread: Haversine
Post: Haversine
| Ever wonder why we still see haversine tables in some navigation books? Me too, until I read this article about them:
https://plus.maths.org/content/lost-lovely-haversine
The main point is this:
"... |
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pabrides |
General Topics Here
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1 |
3,273 |
12-27-2020, 01:43 PM |
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Thread: New member
Post: RE: New member
| In fact I did use an AH but as I said everything except altc has been taken care of. I didn't want you to get confused so I sent you the Ha which comes after the AH division by 2 and before the altc.... |
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pabrides |
General Topics Here
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9 |
7,605 |
12-27-2020, 03:40 AM |
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Thread: Great Voyages
Post: RE: Great Voyages
| Great video, Paul... I split my sides watching it - made me thirsty.
Yeah, Darwin is much taken out of context so no worries there... my faith in god is not shaken. what shakes my faith sometimes ar... |
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pabrides |
General Topics Here
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2 |
2,805 |
12-26-2020, 10:14 PM |
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Thread: New member
Post: RE: New member
| You didnt do too bad.
My lat-long:
10 17.5N
123 57E
I should have given you a better pair of shots.
Hear are two sun shots that put me right on target.
Same DR 10N 124W
Sun LL Dec 25
GMT 23 52 ... |
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pabrides |
General Topics Here
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9 |
7,605 |
12-26-2020, 06:04 PM |
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Thread: Great Voyages
Post: Great Voyages
| I had a dream last night that my crew and I were sailing into dangerous waters. My neighbor's chickens woke me up so I didnt find out what happened, but it made me think of the great voyages of disc... |
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pabrides |
General Topics Here
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2 |
2,805 |
12-26-2020, 04:08 PM |
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Thread: New member
Post: RE: New member
| @steamburn.
Well, I worked your sun shots but without some info. I used -1.5 for IC thinking your positive 1.5 IE was on the scale.
Also I didnt discover your shots were artificial horizon until I ... |
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pabrides |
General Topics Here
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9 |
7,605 |
12-26-2020, 02:08 PM |
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Thread: Polaris
Post: Polaris
| Ok, so this is kinda difficult to admit, but I've never taken a shot of Polaris. I know, it's the most basic thing one can do with which to navigate, but I've sort of shied away from polars until re... |
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pabrides |
The Sight Reduction process
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1 |
2,934 |
12-26-2020, 06:05 AM |
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Thread: New member
Post: RE: New member
| Yeah, this is good. But my question is about your instrument error... is the 1.5 error on or off the arc? |
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pabrides |
General Topics Here
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9 |
7,605 |
12-26-2020, 02:33 AM |
