Get a fix without using the chart (much)? - 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 07-09-2008
davidpm's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Madison
Posts: 3,815
Thanks: 204
Thanked 50 Times in 42 Posts
Rep Power: 8
davidpm is on a distinguished road
Get a fix without using the chart (much)?

Most of my "new" ideas are either common practice that I just never heard of before or a dumb idea. So what do you think about this idea?
The problem:
You are sailing in home waters and you can see a known mark but for whatever reason no other marks are visible and you want a fix without GPS. The solution of course is a running fix but you don’t want to draw on your chart because these are home waters and keeping your chart readable is important.
You happen to have a few plotting worksheets in the nav kit that are just blank pieces of paper with a compass rose and a scale photocopied on an 8.5 by 11 inch copy paper.
So this is what you do to get a pretty good fix without having to draw on your chart.
1. Write down your course (150 degrees), time 0900, speed 6 knots, bearing to known mark 180 degrees.
2. On your worksheet you draw a line for the course (150 degrees). (Where doesn’t matter, just make it the correct course.)
3. Draw another line representing the bearing to known mark (Where doesn’t matter as long as it intersects the course). This represents your start point.
4. Put a mark on the bearing line to represent the known mark. (Where on the line doesn’t matter just make it look about right and it has to be on the bearing line.
5. Decide how long you are going to maintain your current course lets say one-half hour. Multiply your time times your speed ( .5 x 6 = 3 miles)
6. Use any scale, 1" = 1 mile, 1.5" = 1 mile, it doesn’t matter, and mark off the distance you are going to travel, in this case 3 miles from the start point along the course to new point, the DR point. Luckily our plotting worksheet has a couple of scales printed on the side for easy reference or you can use any handy scale.
7. Draw a line through the DR point parallel to the bearing to the known mark. This is the "Advance bearing".
8. All this takes about minute or less. Now all you have to do is relax for the predetermined length of time, in this case one-half hour and stay on course.
9. At the end of the time take a new bearing to the known mark.
10. Draw a line on the worksheet at the new bearing so that it intersects the known mark and the advance bearing line.
11. Using the same scale you used to advance the first bearing, find the distance from the known mark to the point where the advanced bearing and second bearing cross.
12. Now it is dead simple. On the real chart hold any straight edge, even an envelope, at the new bearing so it goes through the mark. Just do an eyeball distance, on my chart one thumb is one mile, from the mark along the bearing and you can put your finger on your position without marking up your chart.
This process is 95% from the book a standard running fix. The wrinkle is that I believe you can use this process on a blank worksheet and not mess up your chart.
What do you think?
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 07-10-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Or you could use a clear cover overlay on the chart, a grease pencil, and a Post-It note sticky arrow for the boat location.
__________________
Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 07-10-2008
Omatako's Avatar
Senior Member
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,449
Thanks: 0
Thanked 30 Times in 27 Posts
Rep Power: 12
Omatako will become famous soon enough
Or use a soft enough pencil that erases easily (4B) and don't make it too sharp. Then a simple running fix is a walk in the park.

I haven't got the patience for the sort of exercise outlined, truth be said, I never even had the patience to read it all

Andre
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 07-10-2008
davidpm's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Madison
Posts: 3,815
Thanks: 204
Thanked 50 Times in 42 Posts
Rep Power: 8
davidpm is on a distinguished road
What I'm really looking for is some kind of sixth sense to just zen a location. I've tried the overlay and 4B pencil trick and it works some times but here in the sound it is often damp if not wet on board and often it made a mess. Maybe I just haven't found the right pencil yet.
Not sure the worksheet idea is a keeper either but it has two advantages.
No mess on the chart and a record of what you did if you want to check yourself.

As far as complication goes it is just a standard running fix, just at the end the distance from the mark is taken off a scale. Any running fix is a lot more complicated to describe than to do.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 07-10-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
One major problem with doing it the way you're suggesting is the plain piece of paper doesn't show you the rocks, shoals and other navigation hazards. So, while you may have some idea of how far you've run and such, it doesn't really help in terms of good navigation and avoiding the hazards without having to copy it over to the chart.
__________________
Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 07-10-2008
soulesailor's Avatar
blue collar cruiser
 
Join Date: Nov 2007
Location: Casco Bay, Maine
Posts: 370
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
soulesailor is on a distinguished road
you could add a little ease into your process by using sheets of maneuvering boards. these are for radar work, mostly, but have angles and scaled distances on them already. buy a pack and photocopy them forever.
__________________

who is staring at the sea is already sailing a little
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 07-10-2008
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice
When I sailed as Second Mate we always carried a version of Scotch tape that you can write on with a pencil. For charts that were used often and the DR track was the same, which is commonly the case on a merchant ship, I'd lay out the course on the chart, confirm it with the Master, and then lay a couple of strips of that tape over it side by side. They were just enough for you to plot your fix and easily erasable afterwards.
__________________
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 07-11-2008
davidpm's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Madison
Posts: 3,815
Thanks: 204
Thanked 50 Times in 42 Posts
Rep Power: 8
davidpm is on a distinguished road
Quote:
Originally Posted by sailingdog View Post
One major problem with doing it the way you're suggesting is the plain piece of paper doesn't show you the rocks, shoals and other navigation hazards. So, while you may have some idea of how far you've run and such, it doesn't really help in terms of good navigation and avoiding the hazards without having to copy it over to the chart.

So true. I have an advantage in local waters however of putting a gel coat barcode on every underwater obstruction.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 07-11-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
At least you'll know which one you hit that way.
Quote:
Originally Posted by davidpm View Post
So true. I have an advantage in local waters however of putting a gel coat barcode on every underwater obstruction.
__________________
Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
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
All About Charts Jim Sexton Learning to Sail Articles 0 11-28-2004 08:00 PM
All About Charts Jim Sexton Seamanship Articles 0 11-28-2004 08:00 PM
All About Charts Jim Sexton Her Sailnet Articles 0 11-28-2004 08:00 PM
Lines of Position, Bearings, and Fixes Jim Sexton Her Sailnet Articles 0 03-23-2004 08:00 PM
Navigating with Radar Jim Sexton Seamanship Articles 0 03-29-2002 08:00 PM


All times are GMT -4. The time now is 08:27 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.