i have an odd question - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 05-24-2006
Junior Member
 
Join Date: May 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
douggiestyle is on a distinguished road
i have an odd question

this deals with navigation, maybe?



any info would be appreciated.
Attached Images
File Type: jpg Sprite_58_ScrShot-1.jpg (48.9 KB, 117 views)
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 05-24-2006
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,975
Thanks: 10
Thanked 90 Times in 82 Posts
Rep Power: 15
RichH will become famous soon enough
The numbers in (parentheses) are radians .... where the circumference of the circle is 2π radians. 180 degrees is π radians. 90 degrees = π/2 radians, etc.
Its a 'trigonometry' plot in radians as well as degrees.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 05-24-2006
Junior Member
 
Join Date: May 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
douggiestyle is on a distinguished road
Quote:
Originally Posted by RichH
The numbers in (parentheses) are radians .... where the circumference of the circle is 2π radians. 180 degrees is π radians. 90 degrees = π/2 radians, etc.
Its a 'trigonometry' plot in radians as well as degrees.
thanks rich

can you tell me where? or is that not possible?
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 05-24-2006
duffer1960's Avatar
Catalina 38 Avantura
 
Join Date: Aug 2000
Location: Michigan
Posts: 208
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
duffer1960 is on a distinguished road
No, they're not radians

The numbers in the parenthesis is the tangent of the angle (x/y). The give away was the very top item (Tan = 0) right above the 0 degree mark. Unfortunately, there is also a mistake, the tangents of 90 and 270 degrees is infinity. Plug the angles into your calculator and hit TAN, you'll see the same answers.

Boy, instead of something something useful, I really wanted to say "and here's your odd answer: "pbpbbp gaaa wubbida wubbida wubbida boiiing!"
__________________
Sincerely,
Russ Duff
Catalina 38, Hull #112
"AVANTURA"
Lake Erie
Grosse Ile, Michigan

Last edited by duffer1960; 05-24-2006 at 09:13 AM.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 05-24-2006
Junior Member
 
Join Date: May 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
douggiestyle is on a distinguished road
Quote:
Originally Posted by duffer1960
The numbers in the parenthesis is the tangent of the angle (x/y). The give away was the very top item (Tan = 0) right above the 0 degree mark. Unfortunately, there is also a mistake, the tangents of 90 and 270 degrees is infinity. Plug the angles into your calculator and hit TAN, you'll see the same answers.

Boy, instead of something something useful, I really wanted to say "and here's your odd answer: "pbpbbp gaaa wubbida wubbida wubbida boiiing!"
lol, thanks for the reply.

well seeing that i have no idea what this all means you could through in two boiings at the end and i wouldnt know the difference.

this is some kind of navigation key? unsure. 360 is north, maybe. there is one other direction and that is 108 could be north.

i was thinking after researching the net that these tangents were derived using a sextant?
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 05-24-2006
Junior Member
 
Join Date: May 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
douggiestyle is on a distinguished road
Quote:
Originally Posted by duffer1960
The numbers in the parenthesis is the tangent of the angle (x/y). The give away was the very top item (Tan = 0) right above the 0 degree mark. Unfortunately, there is also a mistake, the tangents of 90 and 270 degrees is infinity. Plug the angles into your calculator and hit TAN, you'll see the same answers.

Boy, instead of something something useful, I really wanted to say "and here's your odd answer: "pbpbbp gaaa wubbida wubbida wubbida boiiing!"
when you say the tangent of 90 and 270 are infinite what do you mean? are you speaking of the (0) if so, 180 has a tangent of (0) would that mean its infinite also?
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 05-24-2006
Senior Member
 
Join Date: Dec 2002
Location: Maryland
Posts: 526
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
SailinJay is on a distinguished road
In navigation (ignoring the difference between true and magnetic), generally speaking, 360 (or 000) is north, 90 is east, 180 is south, and 270 is west. Southeast would be halfway between 90 and 180--135--so 108 is East Southeast (ESE).
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 05-24-2006
Junior Member
 
Join Date: May 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
douggiestyle is on a distinguished road
Quote:
Originally Posted by SailinJay
In navigation (ignoring the difference between true and magnetic), generally speaking, 360 (or 000) is north, 90 is east, 180 is south, and 270 is west. Southeast would be halfway between 90 and 180--135--so 108 is East Southeast (ESE).
that was my assumption. the only thing is there is another part of the key that shows 108 as north. in others words a compass points to north at 108 degrees. so it shows magnetic north at 360 and in another part of the puzzle it shows 108 as magnetic north. yes this is a puzzle of which i have no idea what it is for, yet. we figured that it was some type of navagational tool used for spherical triginometry which from what i understand was used for celestial navigation.
thanks again for all the input.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 05-24-2006
TrueBlue's Avatar
Señor Member
 
Join Date: Oct 2004
Location: Narragansett Bay
Posts: 4,853
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough
douggiestyle:
That diagram has nothing to do with navigation . . . IMO. Someone, for some reason, wanted to divide a circle along it's radians into 10 equal parts. So, drew the diagram you posted.

Did you find it in a pizza parlor?
__________________
True Blue . . .
sold the Nauticat
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 05-24-2006
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,975
Thanks: 10
Thanked 90 Times in 82 Posts
Rep Power: 15
RichH will become famous soon enough
OW....
Duffer you are right ..... definitely a tangent function and with errors at 270 and 90 degrees - should be infinite value instead of 0

Douggie
A tangent is defined as the opposite side length divided by the adjacent side length with reference to the angles and 'sides' as described by the geometry of the illustration, etc. This is referenced to a circle with "1 unit" (1 ft., 1 mile, 1 mm, etc.) for reference. Tan(angle) = (opposite side)/adjacent side) .... its just a trigonometry 'definitiion'. The numberic values are the ratio of the 'sides' of the triangle that fits 'inside' the circle and as defined by the radius of the circle being at the 'angle' of radius of circle.

For the tangent at either 90 or 270 being 'infinite' .... because the 'y' componet of the 'triangle' described by its projection on the x/y axis (x=0, y=0 at the center of the circle) and with the radius of the circle being 1 ... is: 1 divided by zero and any number divided by zero is infinity.
Tan = x divided by y = x / y; and for 90 degrees, x = 1 but y = 0; so 1/0= infinity.

Trigonometry is sooooooooo easy to explain by drawing the damn stuff ..... and so confusing when describing solely by 'words'.
The basic concepts of trigonometry are so extremely simple but 'words' only makes it 'confusing'.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Depth finder question?? gwp Gear & Maintenance 10 01-12-2009 07:32 PM
Ladder question mcain Gear & Maintenance 14 08-03-2007 11:28 PM
Cruising home/base/marina ICW question thorJ30 General Discussion (sailing related) 3 05-30-2005 06:53 PM
GPS question wallm General Discussion (sailing related) 13 05-30-2004 03:10 AM
question on sails Mark_OD23 General Discussion (sailing related) 6 11-19-2002 05:41 PM


All times are GMT -4. The time now is 10:05 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.