Navigation Questions. Can you do them? - 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 > Skills and Seamanship > Seamanship & Navigation
 Not a Member? 

Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


Reply
 
LinkBack Thread Tools
  #1  
Old 02-26-2010
Boasun's Avatar
Senior Member
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,069
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 9
Boasun will become famous soon enough Boasun will become famous soon enough
Navigation Questions. Can you do them?

1. As we ask these questions, lets see if we can stay away from all charts but the universal chart.
2. These are for your edification, so give a try and you may suceed.

A. Convert the following true bearings to relative bearings of a ship who is steering 302°; 009°, 158°, 328°.










Hint: R - S = T
__________________
1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 02-26-2010
jaschrumpf's Avatar
1975 Newport 28
 
Join Date: Jun 2002
Location: Monrovia, MD
Posts: 573
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
jaschrumpf is on a distinguished road
Quote:
Originally Posted by Boasun View Post
1. As we ask these questions, lets see if we can stay away from all charts but the universal chart.
2. These are for your edification, so give a try and you may suceed.

A. Convert the following true bearings to relative bearings of a ship who is steering 302°; 009°, 158°, 328°.

Hint: R - S = T
Your formula works out to:

R = T + S

However, the army.mil site says the equation is:

RB + SH = TB or

RB = TB - SH

RB = Relative Bearing
SH = Ship's Heading
TB = True Bearing

Why the discrepancy? Am I missing something?
__________________
S/V Free Spirit

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Monrovia, MD
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 02-26-2010
tager's Avatar
Senior Member
 
Join Date: Nov 2008
Posts: 991
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
tager is on a distinguished road
I don't get the question in the OP. I just head for the buoys, what could go wrong?
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 02-26-2010
Member
 
Join Date: Apr 2007
Location: Miami, Florida
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
SeanConnett is on a distinguished road
Ships Steering 302 True
True Bearing 009 - Relative Bearing 067
True Bearing 158 - Relative Bearing 216
True Bearing 328 - Relative Bearing 026
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 02-26-2010
Boasun's Avatar
Senior Member
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,069
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 9
Boasun will become famous soon enough Boasun will become famous soon enough
Quote:
Originally Posted by jaschrumpf View Post
Your formula works out to:

R = T + S

However, the army.mil site says the equation is:

RB + SH = TB or

RB = TB - SH

RB = Relative Bearing
SH = Ship's Heading
TB = True Bearing

Why the discrepancy? Am I missing something?
The discrepancy is from not checking my books first before I wrote the question.
R + S = T or as you said: RB + SH = TB

Must have been a mental lapse from deminta or something...
But I did get people to start thinking...
And when I am teaching I do put errors on the board to see if my students are awake and have studied. But it wasn't suppose to happen this time.
__________________
1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 02-27-2010
Senior Member
 
Join Date: Oct 2009
Posts: 167
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
scraph is on a distinguished road
009°T is 67°R (forward the starboard beam)
158°T is 216°R (port quarter)
328°T is 26°R (off the starboard bow)

The army.mil site is correct. What you want to do with the given information is: TB - SH = RB. If the result is negative, you can either consider it an angle towards port (clockwise) or you can add 360° to normalize it to a standard 0°-360° angle.
__________________
1981 C&C 32
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 02-27-2010
Boasun's Avatar
Senior Member
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,069
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 9
Boasun will become famous soon enough Boasun will become famous soon enough
The Difference in latitude, between two points at 39°W Longitude, is 3°13'; What is the distance in Nautical Miles?
__________________
1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 02-27-2010
Member
 
Join Date: Apr 2007
Location: Miami, Florida
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
SeanConnett is on a distinguished road
I'm going to say 3.21NM.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 02-27-2010
jjablonowski's Avatar
Senior Member
 
Join Date: Aug 2007
Location: Bristol, Rhode Island
Posts: 381
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
jjablonowski is on a distinguished road
193 nm
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 02-27-2010
jrd22's Avatar
Courtney the Dancer
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,844
Thanks: 3
Thanked 18 Times in 18 Posts
Rep Power: 15
jrd22 will become famous soon enough
I agree with jja above. 193NM
__________________
John
SV Laurie Anne

1988 Brewer 40 Pilothouse

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
Working With the Stars—Celestial Navigation Jim Sexton Seamanship Articles 0 05-06-2003 09:00 PM
Working With the Stars—Celestial Navigation Jim Sexton Her Sailnet Articles 0 05-06-2003 09:00 PM
Navigation Basics Jim Sexton Learning to Sail Articles 0 01-04-2002 08:00 PM
Navigation Basics Jim Sexton Seamanship Articles 0 01-04-2002 08:00 PM
Navigation Basics Jim Sexton Her Sailnet Articles 0 01-04-2002 08:00 PM


All times are GMT -4. The time now is 04:03 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.