Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 25-02-2024, 14:44   #1
Marine Service Provider

Join Date: Dec 2023
Posts: 13
Learning celestial navigation?

Here's a great video that will help:

Sail Sail is offline   Reply With Quote
Old 25-02-2024, 17:04   #2
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,316
Re: Learning celestial navigation?

Not to be too negative but if that was all the knowledge required to calculate a position I’d be a happy sailor, he forgot to mention any of the error corrections or the importance of recording the precise time on the chronometer at the exact time of the altitude. I did the whole damn course for a year and only got to physically using a sextant at the end.
skipperpete is online now   Reply With Quote
Old 25-02-2024, 17:17   #3
Registered User
 
grantmc's Avatar

Join Date: Jul 2013
Location: home town Wellington, NZ and Savusavu Fiji
Boat: Reinke S10 & Raven 26
Posts: 1,235
Send a message via Skype™ to grantmc
Re: Learning celestial navigation?

Quote:
Originally Posted by skipperpete View Post
Not to be too negative but if that was all the knowledge required to calculate a position I’d be a happy sailor, he forgot to mention any of the error corrections or the importance of recording the precise time on the chronometer at the exact time of the altitude. I did the whole damn course for a year and only got to physically using a sextant at the end.
To be fair Pete, that video is simply one in a long series of videos that are on their channel. They've broken celestial navigation down into different 'chapters' somewhat like a book and each has a chapter. That one posted here is obviously the how to use the sextant to take a sight chapter. And yes I agree, somewhat superficial.

And yes it's a long course and taking sextant sights is well down towards the end. In our course we had to learn the maths, (rather than tables) to find our position on Earth.
__________________
Grant Mc
The cure for everything is salt water: sweat, tears or the sea. Yeah right, I wish.
grantmc is offline   Reply With Quote
Old 25-02-2024, 18:05   #4
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,316
Re: Learning celestial navigation?

Thanks for that grantmc, I was a bit harsh and started from the wrong end of the video series , I guess the more important stuff is in other videos. I’m happy to see that cruisers are still taking celestial nav seriously.
skipperpete is online now   Reply With Quote
Old 25-02-2024, 18:17   #5
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 663
Re: Learning celestial navigation?

Yeah, this guy has a lot of great videos on celestial navigation. He's one of the best presenters of the topic, IMHO.
__________________
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet
NavList Celestial Navigation Forum
SeanPatrick is online now   Reply With Quote
Old 25-02-2024, 23:03   #6
Registered User
 
Mickeyrouse's Avatar

Join Date: Jun 2012
Location: Texas
Boat: Hinckley Bermuda 40
Posts: 848
Images: 5
Re: Learning celestial navigation?

I’ve had cheap plastic sextants and respectable Astrals for almost fifty years. I’ve read books, watched videos, taken courses and I know no more now than when I started. Affordable,tt LORAN came along and it was convenient to put off the commitment to reslly lesrn, when tge time came that I was really gone to need accurate navigation, $200 Magellan GOS was on the market. The “why bother with celestial” was then just a slight nudge away. I nudged.
I have a lot of respect for celestial navigators, but by the tables, almanac updates, plottingee charts, etc, and a chronometer get bought, GPS isGPS is just cheapet, fastdr, and and much more accurate- and thus
__________________
Why won’t the money go as far as the boat will?
Mickeyrouse is offline   Reply With Quote
Old 25-02-2024, 23:27   #7
Registered User
 
Fore and Aft's Avatar

Join Date: Jan 2015
Location: Gympie
Boat: Volkscruiser
Posts: 2,692
Re: Learning celestial navigation?

Sail Sail Maiden Factor put out some great sextant videos. Now if Hadley put out a fibreglass grinding video and antifouling video she would be my dream lady.
Cheers
Attached Thumbnails
Click image for larger version

Name:	Screenshot_2024-02-26-17-23-08-489.jpg
Views:	63
Size:	300.1 KB
ID:	286862  
Fore and Aft is online now   Reply With Quote
Old 26-02-2024, 07:17   #8
Registered User
 
mottseng's Avatar

Join Date: Feb 2013
Location: Ontario Canada
Boat: 1985 Canadian Sailcraft CS30
Posts: 502
Re: Learning celestial navigation?

This is great and I agree that all sailors should at least learn the basics of celestial navigation. If for no other reason than to have something to talk about. Learning something new is never a bad thing.
mottseng is offline   Reply With Quote
Old 26-02-2024, 07:21   #9
Marine Service Provider

Join Date: Jan 2019
Boat: Beneteau 432, C&C Landfall 42, Roberts Offshore 38
Posts: 6,331
Re: Learning celestial navigation?

Learning from a book or video is tough....best way to learn is to have an old salt teach you with a hands on method...a dying breed I'm afraid
MicHughV is online now   Reply With Quote
Old 26-02-2024, 21:20   #10
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 663
Re: Learning celestial navigation?

Quote:
Originally Posted by Mickeyrouse View Post
I have a lot of respect for celestial navigators, but by [the time] the tables, almanac updates, plotting charts, etc, and a chronometer get bought, GPS is just cheapest, faster, and much more accurate- and thus

It's 2024. You don't need any of that anymore.

There are many programs and apps that will do all of the math and tedious work for you. All you have to do is measure the altitudes, input the data and tell the program roughly where you think you are. Then it spits out your fix.

And these days, even the cheapest digital watch will keep time well enough. Gary LaPook, a member of NavList, ran an experiment with three cheap digital watches (US$17 each) over the course of at least two years:

Quote:
Originally Posted by Gary LaPook
So after 746 days, more than two years, the worst single error is 14 seconds making an error of 3.5 NM in longitude at the equator. Using the average of the three watches results in about a 0.25 NM error in longitude.

Of course GNSS (GPS, BeiDou, GLONASS, Galileo) is the best primary choice for navigation. And the best backup for a GPS is another GPS. But a celestial fix is a great way to cross-check what the GPS is telling you. It's a system that is entirely independent from GPS. And that's more important than ever with all of the GPS jamming and spoofing that's been going on.


Anyway, I know a guy who made a pretty good celestial navigation spreadsheet that you can download for free!
__________________
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet
NavList Celestial Navigation Forum
SeanPatrick is online now   Reply With Quote
Old 27-02-2024, 04:51   #11
Registered User

Join Date: Jan 2021
Location: Timmins, ON
Boat: CL14 #1179
Posts: 133
Re: Learning celestial navigation?

Of all the videos ive watched on CN, this one helped me the most.

Wilyum is offline   Reply With Quote
Old 27-02-2024, 04:58   #12
Registered User
 
double u's Avatar

Join Date: Feb 2016
Location: forest city
Boat: no boat any more
Posts: 2,510
Re: Learning celestial navigation?

forget videos!
what you need is a simple book &
PRACTICE!PRACTICE!PRACTICE!PRACTICE!PRACTICE!PRACT ICE!PRACTICE!PRACTICE!PRACTICE!PRACTICE!PRACTICE!P RACTICE!PRACTICE!PRACTICE!PRACTICE!PRACTICE!PRACTI CE!PRACTICE!PRACTICE!PRACTICE!PRACTICE!
(& not just in your back yard with a dish of engine oil for horizon...)
__________________
...not all who wander are lost!
double u is offline   Reply With Quote
Old 03-03-2024, 03:16   #13
Registered User

Join Date: Feb 2024
Location: Hamble
Boat: Moody 336
Posts: 2
Re: Learning celestial navigation?

Has anyone come across the TeacupNav software and web site recently. It was developed by Rodger Farley some years ago and is one of the best pieces of astro navigation plotting software I have come across. Here is a link to an article about it (Astro Nav from Home) No, 2 in the Useful Articles list.
His book is on amazon but it is the software I am after.
Cheers,
Andy Johnson
Andy Johnson is offline   Reply With Quote
Old 03-03-2024, 07:55   #14
Registered User

Join Date: Feb 2024
Location: Hamble
Boat: Moody 336
Posts: 2
Re: Learning celestial navigation?

Can I offer my book "Astro Navigation from Home" ! It covers all types of sights using chosen position method and shows how to use an app to get your altitudes which allows as much practice as you can tolerate. You basically make up your own examples. Also show where you get all the almanacs and tables you will need as free pdf files. Web address is Astro Nav from Home .
Cheers,
Andy
Andy Johnson is offline   Reply With Quote
Old 03-03-2024, 19:29   #15
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 663
Re: Learning celestial navigation?

PM sent.
__________________
If you have any questions about celestial navigation, ask me!
Celestial Navigation Spreadsheet
NavList Celestial Navigation Forum
SeanPatrick is online now   Reply With Quote
Reply

Tags
celestial navigation, learning, navigation

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Learning Celestial Navigation? malyea General Sailing Forum 15 06-10-2015 14:53
Materials for learning celestial navigation in an emergency tominny Navigation 44 05-08-2015 23:18
Celestial Navigation Help Needed Loose Ends Navigation 67 10-11-2011 12:19
Best Book for Learning Celestial Navigation? pressuredrop Navigation 6 05-12-2009 08:47
Celestial Navigation SkiprJohn Navigation 45 29-12-2008 22:15

Advertise Here


All times are GMT -7. The time now is 18:14.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.